[FFmpeg-soc] [soc] Add choice of threading algorithm to AVCodecContext.

[Alexander Strange]

 Use it to simplify USE_* macros.
 FF_THREAD_AUTO needs to be handled better - even if a codec can handle frame-threads, we still don't want to use them if there are enough slices available.
---
 libavcodec/avcodec.h |   10 ++++++++++
 libavcodec/thread.c  |   15 ++++++++++++++-
 libavcodec/thread.h  |    8 ++++++--
 libavcodec/utils.c   |    6 +++++-
 4 files changed, 35 insertions(+), 4 deletions(-)
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