[poppler] Poppler 0.18.1 released

[Albert Astals Cid]

Available from
http://poppler.freedesktop.org/poppler-0.18.1.tar.gz

Changes against the 0.18.0 release:
core:
 * PSOutputDev: Output PS that does not confuse libspectre
 * PSOutputDev: Fix tiling pattern fill matrix. Bug #41374
 * PSOutputDev: Emit non repeating patterns just once
 * PSOutputDev: Fix uncolored tiling patterns. Bug #41462
 * CairoOutputDev: Fix crash when using poppler_page_get_image()
 * CairoOutputDev: Fix various setSoftMask bugs. Bug #41005
        
utils:
 * pdftocairo: Flush/close files one we are done using them
 * pdftocairo: Compile in Windows
        
build system:
 * CMake: Fix typo in option description
 * CMake: Correctly include fontconfig include dir
 * Remove poppler-cairo dependency from poppler-glib pkg-config file
        
qt4:
 * Minor fixes in documentation

Testing, patches and bug reports welcome.

Note: This carries a soversion increase in poppler core library

Albert