Only enable SSE/3DNOW optimizations when they have been enabled at compilation. Fixes shared build with SSE/3DNOW disabled but MMX and yasm enabled.
Only enable SSE/3DNOW optimizations when they have been enabled at compilation.
Fixes shared build with SSE/3DNOW disabled but MMX and yasm enabled.


git-svn-id: a4d7c1866f8397a4106e0b57fc4fbf792bbdaaaf@17451 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

prajnashi/ffmpeg,prajnashi/ffmpeg,prajnashi/ffmpeg,prajnashi/ffmpeg