Log Message:
Update poppler-* to 0.50.0:

Release 0.50.0
        core:
         * PSOutputDev: Fix PS conversion for some files. Bug #63963
         * Fix Outline parsing on broken documents. Bug #98732
         * Fix PDFDoc::saveIncrementalUpdate()'s detection of document being \ 
modified. Bug #96561
         * SplashOutputDev: Read softmask into memstrean in case of matte. Bug #97803
         * Bail out if Hints nBitsNumObjects or nBitsDiffGroupLength are greater \ 
than 32. Bug #94941
         * CairoOutputDev: initialize CairoOutputDev::antialias. Bug #98983
         * Fix crash when loading some thumbnails. Bug #97870

        utils:
         * pdftoppm: Fix -tiff -gray/-mono incorrect output.
         * pdftops: add -passlevel1customcolor. Bug #97193

        build system:
         * Default to libopenjpeg2 instead of libopenjpeg1

        qt:
         * Support OCG state change links

        glib:
         * Use g_slice_new0 for PopplerActionLayer. Bug #98786

Release 0.49.0
        core:
         * Merge type3 glyph handling from xpdf 3.04. Bug #96667
         * Continue rendering in case of 'Singular matrix in shading pattern \ 
fill. Bug #98623
         * Fix memory leak in parametrized gouraudTriangleShadedFill
         * Fix crash on broken files
         * PDFDoc::setDocInfoStringEntry(): treat value consisting of just the \ 
unicode marker as an empty string
         * Fix UBSAN warning
         * Misc compile fixes

        utils:
         * pdfseparate: remove extra '%' in error message

        build system:
         * configure: Fix typo in disable nss help string