[poppler] Poppler cache class

[Albert Astals Cid]

Hi, i've factored out the cache class Koji implemented for caching 
GfxICCBasedColorSpace and used it for PostScriptFunction results.

This patch makes file from bug 21562 render in 8 seconds instead of 24 (still 
Adobe achieves 3) with a small 5 items cache.

Do you agree to commit?

Albert
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