vp78: Align the intra4x4_pred_mode_top array within VP8Macroblock

This array is written using AV_WN32A, assuming alignment.

This hopefully fixes the failing vp7 fate test on sparc.

Signed-off-by: Martin Storsjö <martin@martin.st>
Merge commit 'a6ac4fcce44108f6f87278b8d12e890576f46a62'

* commit 'a6ac4fcce44108f6f87278b8d12e890576f46a62':
  vp78: Align the intra4x4_pred_mode_top array within VP8Macroblock

Merged-by: Michael Niedermayer <michaelni@gmx.at>
avformat: add av_format_inject_global_side_data(), and disable it by default

After this commit applications needs to call av_format_inject_global_side_data()
or handle AVStream side data by some other means if they want it not to be lost.

This fixes a API incompatibility with libav.
libav API does not allow the data to be passed through AVPackets

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