Merge commit 'eb90a2091ffb94d8c29aaa5ff50f4192520254fc'

* commit 'eb90a2091ffb94d8c29aaa5ff50f4192520254fc':
  pthread: Fix deadlock during thread initialization

Conflicts:
	libavcodec/pthread.c

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

diff --cc libavfilter/pthread.c
Simple merge