Update poppler* to 0.46.0.

Release 0.46.0
        core:
        * cairo: fix bug in setAntialias()
        * cairo: Fix tiling patterns with BBox with non-zero x,y
        * cairo: try finding glyphs in substitute fonts by unicode value. Bug #96994
        * Added XRef modification flag
        * Added DocInfo setters & getters
        * Be less strict when parsing FitH Link destinations. Bug #96661

        utils:
        * pdftocairo: revert the use of groups for blending into white page
        * pdftocairo: Use fprintf for printing errors
        * pdfinfo: Don't print pdf info when printing metadata, javascript, or structure. Bug #96801

        glib:
        * Added document property setters & simplified getters
        * make document metatag gobject properties writeable

        cpp:
        * pass len to GooString constructor in detail::ustring_to_unicode_GooString(). Bug #96426
        * Added functions to save a document
        * Added document property setters & getters

        qt4:
        * Added document property setters & simplified getters

        qt5:
        * Added document property setters & simplified getters

        build system:
        * configure: Don't use -fPIC on cygwin
        * configure: Work with non gnu greps

Release 0.45.0
        core:
        * SplashOutputDev: Fix iccTransform + splashModeXBGR8
        * Fix memory leaks
        * Fix crash in broken files. Bug #95567. Bug #96027
        * Emulate some non portable glibc functions when not available

        utils:
        * pdftohtml: Fix crash in broken files. Bug #95563
        * pdfinfo: convert dates to local time zone
        * pdfinfo: add -isodates for printing dates in ISO-8601 format
        * pdfinfo: Fix memory leaks

        glib:
        * return date in UTC instead of local time. Bug #94173

        cpp:
        * switched from detail::convert_date() to core's dateStringToTime()

(wiz)