xfig: update to 3.2.8.

Patchlevel 8 (Dez 2020)

USER INTERFACE CHANGES:

o Shift + Wheel Up pans left, Shift + Wheel Down pans right.
  Alt or Meta + Wheel Up pops up the edit panel, Alt or Meta + Wheel
  Down pops up the drawing panel. Previously, Shift + Wheel Up or Down
  popped up the edit or drawing panel, respectively, and panning
  sideways could only be achieved by moving the wheel sideways.

NEW FEATURES:

o To display gif image files, either giftopnm and ppmtopcx from the
  netpbm package, imagemagick, or graphicsmagick must be installed.
o Obey the resolution given in embedded png, tiff and jpeg image files.
o Embedded image files are displayed in full color, not reduced to
  a maximum of 256 colors.
o Display embedded pdf files.

BUGS FIXED:

o Read version 1.3 fig files.
o The default resolution of embedded raster images is changed
  from 80 dpi to 72 dpi.
o Read compressed files, but do not silently uncompress them.
o Get correct bounding box (/MediaBox) of embedded pdf files.


(fcambus)