Log Message:
poppler*: update to 0.79.0

Release 0.79.0:
        core:
         * Fix regression on TextSelectionPainter
         * Fix parsing of DefaultAppearance
         * Fix memory leak in PostScriptFunction
         * Fix crashes in fuzzed files

        qt5:
         * Implemented support for setIcon by changing appearance
         * Added option to set the form available to print
         * QString::null is deprecated, use QString()
         * Replace deprecated qStableSort with std::stable_sort

        build system:
         * Turn README into README.md and expand it

Release 0.78.0:
        core:
         * Fix line annotation arrows for usage in dimensioning
         * Handle Ink annots without an InkList but with an AP
         * Fix typos preventing parsing of Movie start and duration
         * Fix crash on malformed files

        glib:
         * Add poppler_document_create_dests_tree()
         * Don't use the deprecated g_type_class_add_private()
         * Document the differences between render() and render_for_printing()
         * Fix introspection for poppler_document_new_from_data
         * Don't create PopplerInputStream with length 0. Issue #414
         * Document G_IO_ERROR as a possible error condition
         * docs: Add index for API new in 0.78

        build system:
         * Fixes cross compilation of gir in Void Linux
         * Add -Wshadow to the default warning flags
         * install pkg-config pc files if pkg-config is found

Release 0.77.0:
        core:
         * Fix crash on signature handling. Issue #766
         * Fix small memory leak in SignatureHandler::getCertificateInfo
         * Splash: Restrict filling of overlapping boxes. Issue #750
         * Fix crash on malformed files

        qt5:
         * Fix optional content handling with exclusive layers

        cpp:
         * Make render_page thread-safe

        utils:
         * pdfsig: Fix small memory leak
         * pdftotext: Fix typo in manpage