xf86-video-savage: use xf86XVFillKeyHelperDrawable if available for colorkey filling

[Alex Villací­s Lasso]

A few days ago I reported a bug 
(https://bugs.freedesktop.org/show_bug.cgi?id=18378) about XV 
colorkeying breaking when Metacity compositing is enabled. Michel Dänzer 
was kind enough to explain the root issue to me, and I prepared a patch, 
here attached. Please review.

-- 
perl -e '$x=2.4;print sprintf("%.0f + %.0f = %.0f\n",$x,$x,$x+$x);'

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