[FFmpeg-soc] [soc] Simplify changes to non-pthreads and don't call thread_init from open if it was already called.

[Alexander Strange]

This will cause an assert failure if clients call thread_init again after open.
---
 libavcodec/beosthread.c |    1 -
 libavcodec/os2thread.c  |    1 -
 libavcodec/pthread.c    |    2 +-
 libavcodec/utils.c      |    2 +-
 libavcodec/w32thread.c  |    1 -
 5 files changed, 2 insertions(+), 5 deletions(-)
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