Log Message:
Update poppler to 0.42.

Poppler 0.42 Release

        core:
         * Add the support for version 5 + revision 6 documents. Bug #85368
         * Add initial support for Signature handling
         * Initialize gamut mapping multipliers in ::copy() functions. Bug #90697
         * Implement jpx streams support with depth < 8
         * Handle SMaskInData = 0 for JPX encoded images. Bug #93468
         * Fix rendering of some broken PDF files. Bug #92508
         * PSOutputDev: Support for LZW encoding
         * PSOutputDev: Add support for Flate compression in Level 3 output.
         * SplashOuputDev: Implement function shading. Bug #94441
         * SplashOuputDev: Improve rendering of some non embedded fonts. Bug #94054
         * SplashOuputDev: Fall back to Gfx implementation of tiling pattern if \ 
repetition rate is small. Bug #90596
         * SplashOuputDev: Implementation of Matte entries in softmasks of \ 
softmasked images. Bug #22473
         * SplashOuputDev: assure line width > 0 in case of text stroke. Bug \ 
#94038
         * TextOuputDev: Cache result of inner loop in visitDepthFirst. Bug #77087
         * Avoid attempting a tiling pattern fill with a singular transform matrix

        utils:
         * pdfinfo: Add option to show document structure
         * pdfsig: New command that gives information about signature

        qt4:
         * Fix bug in links to remote documents getting the page number wrong \ 
sometimes

        qt5:
         * Fix bug in links to remote documents getting the page number wrong \ 
sometimes

Poppler 0.41 Releases

        core:
         * CairoOutputDev: add missing font types (fontCIDType0COT and \ 
fontTrueTypeOT). Bug #93559
         * SplashOutputDev: Adjust limit check and check in addition bitmap \ 
pointer. Bug #94053

        utils:
         * pdfseparate: Refine resource detection
         * pdfinfo: fix man page