[MPlayer-dev-eng] [PATCH] cmov detection and draw_alpha fixes

[Alban Bedel]

Hi,

since i added the box backgrounds in the osd menu i noticed a nasty bug
with the draw alpha functions. They happily overflow leading to some nice
distortions :/ So i went on to fix that, the mmx version are trivial to
fix just change the final paddb to a paddusb. However for the generic
i386 asm for rgb24/32 i didn't found a nice and quick solution w/o
using cmov (their probably is or ?). So i used cmov and let the rest
fallback on C.

Sadly cmov is not present on all cpu, currently it is only used in lavc
under a #if __CPU__ >= 686. However their are some 586 with cmov (for ex
the AMD Geode which is a 586 with cmov and mmx). So i added a proper test
to configure and cpudetect.c.

	Albeu
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