bink: Rename BinkDSPContext member so as not to clash with BlockDSPContext
Remove all Blackfin architecture optimizations

Blackfin is a painful platform to work with, no test machines are available
and the range of multimedia applications is dubious. Thus it only represents
a maintenance burden.
Merge commit 'b88cc5cca111132b42c2ee99662bfefe7652e3da'

* commit 'b88cc5cca111132b42c2ee99662bfefe7652e3da':
  bink: Rename BinkDSPContext member so as not to clash with BlockDSPContext

Conflicts:
	libavcodec/bink.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '880e2aa23645ed9871c66ee1cbd00f93c72d2d73'

* commit '880e2aa23645ed9871c66ee1cbd00f93c72d2d73':
  Remove all Blackfin architecture optimizations

Conflicts:
	libavcodec/bfin/dsputil.S
	libavcodec/bfin/dsputil_init.c
	libavcodec/bfin/fdct_bfin.S
	libavcodec/bfin/hpel_pixels_no_rnd.S
	libavcodec/bfin/hpeldsp_init.c
	libavcodec/bfin/idct_bfin.S
	libavcodec/bfin/mathops.h
	libavcodec/bfin/pixels.S
	libavcodec/bfin/pixels.h
	libavcodec/bfin/vp3dsp.S
	libavcodec/bfin/vp3dsp_init.c
	libavutil/bfin/asm.h
	libavutil/bfin/attributes.h
	libswscale/bfin/internal_bfin.S
	libswscale/bfin/swscale_bfin.c
	libswscale/bfin/yuv2rgb_bfin.c
	libswscale/swscale_internal.h
	libswscale/version.h

If someone wants to maintain blackfin support in FFmpeg, please contact
ffmpeg-devel@ffmpeg.org

Merged-by: Michael Niedermayer <michaelni@gmx.at>
bfin: add README

Based on sh4/README
Suggested-by: jamrial
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>