[vlc-devel] [patch] MMX/3dNow purge & emms fixes

[jnqnfe at gmail.com]

as discussed separately, here are some patches purging MMX acceleration
(building upon previous work)

I have also included here:
1) purge of 3dNow
2) fixes relating to incorrect use of the `emms` MMX related
instruction with pure SSE2 code

I presumed AltiVec needs to remain.

#01: purges MMX from i420_yuy2/i422_yuy2/i420_rgb
#02: converts parts of deinterlace filter that only have MMXEXT
acceleration to use SSE2 instead (simple register targetting change
only, does not take advantage yet of wider registers)
#03: purges MMX/MMXEXT from deinterlace filter
#04: purges 3dNow from deinterlace filter
#05: switches `emms` to `sfence` for SSE2 code in deinterlace filter
#06: purges MMX from gradfun
#07: purges incorrect SSE2 use of `emms` with grain
#08: purges incorrect SSE2 use of `emms` with the copy chroma mod
#09: purges the MMX mod from configure
#10: purges the 3dNow mod from configure

fyi, this deliberately does **not**:
 - purge the detection routines from misc/cpu, since they are still
used in a few places and may remain used by 3rd party plugins
 - purge code setting MMX/MMXEXT/3dNow flags for 3rd party libs
(libmpeg2, postproc, swscale, x246)
 - touch the disable MMX/MMXEXT controls for android (ffmpeg)
 - touch the `HAVE_MMX` define in codec/avcodec/avcodec.c
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