Update to goffice0.10 version 0.10.21, to allow an update of gnumeric112.

Pkgsrc changes:
 * Add various BUILDLINK_API_DEPENDS settings to express the dependency
   requirements in the upstream configure.ac.
 * Adapt PLIST
 * Add use of libxslt in the buildlink3.mk file.

Upstream changes extracted from ChangeLog:

goffice 0.10.21:
* clip each rectangle before drawing. [#744076]
* Avoid critical when loading fails.
* ensure that GOPixbuf keeps the original data around. [#745297]
* If no image data is given, create an unknown image placeholder.
* Plug various leaks.
* Doc fix.
* Set auto_font, apply font theming.
  Only save font when not auto.
  Be fairly smart about reading files created prior to this fix.
  Include auto_font and auto_color.
  Use sufficient precision.
* Use 0.0, not G_MINDOUBLE, to make cairo
  produce dots. That seems to be the documented way to do it.
* Ignore nans. [#744200]
* Protect oval drawing against invalid sizes.
* Avoid overflow.  Round a bit more consistently.
* Only draw oval heads when sizes are positive.
* Protect against missing data
* Initialize regres. Why didn't the compiler warn about that?

goffice 0.10.20:
* Don't wipe out marker colours just because the shape auto.
* Ensure that the dims number is correct in all cases. [see #743507]

goffice 0.10.19:
* Fixed typo in default map name.
* Allow the window to be maximized. [see #742897]
* Avoid rounding errors by using go_cospi and go_sinpi.
* Don't loose any data when using automatic bins. [#742996]
* Protect against missing data. [#742859]
* Add missing libraries to Requires.private.
* Don't return invalid ticks.
* Allow custom ticks and grid lines for axis lines. [#600482]
* Fix axis title position when at high coordinate.
* Don't use a data vector with no valid value.  [#741910]
* Protect against NULL y vector.
* Implement native scrolling.  [#741394]
* Only make window composited if the screen is. See bug 741455.
* Fix flags argument of gtk_icon_theme_load_icon.
* Make this work with icon names.
* Lean a bit heavier on libxml's encoding guess instead of g_get_charset
  which may be a bit random.
* Actually handle the claimed data: prefix.
* Avoid GtkColorSelDialog which is
  _gone_ from current gtk+. Use GtkColorChooserWidget instead.
* Handle a stock_id which is really an icon name.
* Simplify using gtk_action_create_icon which also handled named icons.
* Cleanup. Avoid warnings. Avoid unneccesary overflow.
* Plug leak.
* (_goc_canvas_remove_item): New function. Use of this fixes
  several crashes.
* If the canvas changes, tell the old canvas that child is gone.
* Don't mess directly with the canvas' members.
* Move the titles with the axis when some other axis has an offset. [#684777]
* Allow rotation of axis line labels. [#740198]
* Add new goc_canvas_invalidate_region().
* Don't use deprecated signal and functions.

goffice 0.10.18:
* Add baseline anchor values.
* Don't pass NULL to g_strtod(). [#735555]
* Don't skip encoding on user entered names
* Better file mode, (color_maps_load_from_dir): don't check the mime type
  as it seems not so reliable, just check the extension. [#735007]
* Create $HOME/.goffice/colormaps if needed. [#735008]
* Fixed more auto style issues. [see Debian #757611]
* Copy the pixbuf and set it back onto the image. An ABI change in gtk
  means that changes no longer take effect right away if we just change
  the image's pixbuf directly. Fixes #733350.
* Fixed persistence of line width.
* Center ticks by default.
* Add a missing cairo_restore() call.
* Fix theme support. [#733403]

goffice 0.10.17:
* Ensure test is locale independent.
* New GoUnit objects.
* Add control for 3D plots axes lengths. [#694746]

goffice 0.10.16:
* Don't crash when selecting the 3d box.
* Save and read auto-width.  Don't save width when auto_width.
* Apply font color.  Save auto_color and auto_font (but see
  comments).  Read auto-color.
* Keep values as integers as long as possible.
* Restore dashes with dots.
* Add a view class for the 3d box to support data that are view dependent.
* Change gog_chart_map_3d_new() signature to suppor the new view class.
* (gog_3d_box_populate_editor): fixed criticals.
* Don't use GDK_THREADS_*.  [728793]

goffice 0.10.15:
* goffice/math/go-dtoa.c (fmt_fp): Fix FMR.
  (go_dtoa): Speed up shortest-representation.
  Simple test for shortest-representation.
  When we have infinite room, just use go_dtoa to get the shortest
  representation.
  Improve short-representation handling.
* Add arguments, change all callers and output gnm:min-integer-chars
  Handle the difference between ? and #
* Add expand fields to GogPosition.
* Make charts expand.
* Fix alignment.
* Take expand field into account. [#728752]
* (go_dtoa): Mostly implement the shortest-version flag.
* Properly handle float/double properties.
* Handle TOK_REPEATED_CHAR.
* Improve phase detection.
* Handle text formats here too. That might not seem logical, but a
  text format really just has an "@" instead of some combination of
  0/#/?; all the other parts are handled identically.
* Handle invisible characters again.
* Use available space when position is manual but size is automatic. [#728391]
* Zero requisition before calling virtual method. All callers expect this.
* Fix argument type for g_lstat.
* Use g_stat, not raw stat.
* Don't output (meaningless) values for things that are "auto".
* (fmt_fp): Portability improvement.
* Explicitly allow manual charts size. [728134]
* Take manual size flags into account.
* Use a canonical gboolean as argument to gtk_widget_set_visible.

goffice 0.10.14:
* When building with !GOFFICE_WITH_LONG_DOUBLE, don't use go_finitel.
  Just assume we have isfinite.
* Drop a decimal by double-rounding the decimal string unless the
  string ends in '5'.
* (go_dtoa): Improve long-double handling.
* (fmt_fp): Three fixes from musl. (One we already had.)
* Another leak fix.  Introspection fix.
* (go_dtoa): New function.
  (fmt_fp): Fix buffer overrun. Hit "%.3E" for 999999999.
* Use go_dtoa extensively.
* Also flush string on '#' and '?'.
* Fix problem for 2^51 and like integers.
* New test program.
* Use go_ascii_dtoa.  Remove unused beyond_precision.
* Only use last condition as default if it is implicit. If that in
  turn means we have no default, use General.
* Always call cairo_restore().
* Remove remaining cond_part references. Handle embedded text.
* Plug leak.
* Retry failed deactivations as long as we make progress. (Some
  plugins depend on others.)
* Implement numbered colours instead of just parsing them.
* Match what LO does for "General".
  Make sure we don't accidentally output a non-character token as-if
  it was a single character.
* Don't make up a number format with nothing but maps in it. LO
  doesn't really like that.
  New argument keep_open controls whether to close the outermost xml tag.
* Handle conditional formats.
* Fix format prefix strings
* Figure out the correct number of digits to use for condition values

goffice 0.10.13:
* Plug leaks.
* Dispose of ->root instead of simply clearing it.
* Dispose of style context, if we have one.
* Don't save and restore style->width. Code was changed four years ago to
  copy the style. And restoring after the _unref is bad.
* Add test for buggy math library (probably caused by compiler bug).
* Fix criticals related to style contexts destruction.
* Really accept leave_notify events. [#668103][see also #706659]
* Write any started number.
* Don't reverse the order of elements. Fixes #698630.
* Write invisible characters but also write blank for LO and friends
* use GsfInputHTTP for URLs starting with "http://" or "https://". [see #724970]
* configure.ac: add test for lsm_itex_to_mathml
* use a local copy of lsm_itex_to_mathml and
  friend when not available. [#725693]
* Remove extra DESTDIR. Patch from Julian Sikorski. [#725684]

goffice 0.10.12:
* Fixed parent class.
* Makefile.am: add new mmlitex subdir.
* configure.ac: need libxslt.
* Fix data cleaning issues.
* Use the new GoMathEditor widget.
* New math editor widget.
* Use GtkGrid as parent.
* Add the new GoMathEditor widget.
* New MathML to ITEX convertor.
* New math equations component.

goffice 0.10.11:
* (none?)

goffice 0.10.10:
* && --> ||. Fixes bug 723820.
* Redo all icons here.
* Simplify sizing of icons.
* Handle reconfiguration of the toolbar the item is in.
* Always save the axis position. [#722402]
* Fix compiler warning.  [#721004]
* If we're not width-limited, add an extra digit if we don't
  round-trip properly.  Fix dropping of ".00000".
* Do quarters too.
* Improve accuracy.
* (go_add_epsilon, go_sub_epsilon): Base upon C99's nextafter.
* Test asin and acos.
* (go_complex_angle_pi): Handle diagonals too.
* Test hypot.
* Fix the on-axis case. *Sigh*
* Fix elements number in polar plot series. [#720355]
* Improve prevention of intermediate overflow.
* Fix crasher [#720310], fix valgrind warning.
* Fix enum confusion.
* Check value of go_quad_2pi.  Test go_quad_atan2.
* Fix class over premature overflow problems.
* Fix graph guru appearance when used with gtk+-3.10. [#719681]


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