[poppler] Poppler 0.40.0 released

[Albert Astals Cid]

Available from
http://poppler.freedesktop.org/poppler-0.40.0.tar.xz

Changes against 0.39.0 include:
        core:
         * CairoOutputDev: Use shape mask with soft mask. Bug #91931
         * TextOutputDev: Handle right-to-left text in search
         * TextOutputDev: Fix finding Arabic Presentation Forms ligatures
         * Fix crash in invalid file. Bug #93476
         * Regression test improvements

        utils:
         * pdftocairo: fix writing to stdout out with image output
         * pdftocairo: document that -singlefile appends file type. Bug #86254
         * pdftocairo: ensure surface flushed before accessing image data
         * pdftocairo: check for invalid use of options. Bug #92195
         * pdfunite: Fix typo in manual

        build system:
         * Improve cmake build system

We seem to have been able to produce a release without breaking the API nor 
ABI of the core :D

Testing, patches and bug reports welcome.

Cheers,
  Albert