[x265] [PATCH] restore WINXP_SUPPORT build option, workaround for CONDITION_VARIABLE on XP

[Mario Rohkrämer]

According to my tests on an AMD Phenom II X6 1045T, speedup is marginal  
but probable in the average.

-- 

Fun and success!
Mario *LigH* Rohkrämer
mailto:contact at ligh.de
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