mpegvideo_enc: Don't call ff_h263dsp_init unconditionally

This fixes builds with e.g. --disable-decoders --disable-encoders
--enable-encoder=mjpeg.

Signed-off-by: Martin Storsjö <martin@martin.st>
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  mpegvideo_enc: Don't call ff_h263dsp_init unconditionally

Conflicts:
	libavcodec/mpegvideo_enc.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
examples/muxing: flush encoders at the end
examples/muxing: reindent after previous commit
avcodec/bitstream: assert that no integer overflow happened when writing codes in build_table()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/lossless_videodsp: Pass AVCodecContext to init

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/x86/lossless_videodsp: disable median optimizations for 16bps

They only support upto 15bps

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>