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swscale: purge obsolete SIMD selection

Lyndon Brown requested to merge jnqnfe/vlc:simd_swscale into master

the swscale cpu feature flags were deprecated in 2012 and removed in 2015 (1) in favour of auto-detection, hence the version guard used within the GetSwsCpuMask() function.

in vlc v4.0-dev we are purging MMX/MMXEXT and so have a need to remove the corresponding portions of the function. this alone though would leave the function and related code only catering to enabling altivec in the one special case of compiling with an old swscale version. i felt that it was probably better to just rip it all out.

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