platform_sem_init
platform_sem_post
platform_sem_wait
with parameters identical to those on Linux.
Changed code in video_display/* and Makefile.in accordingly. The only thing left is some
workaround for sem_getvalue on Mac. I have some ideas how to do that (as seen in SDL implementation and
comming from the discussion with Jirka Matela). Unfortunately both are not thread safe.
Some cleaning in rtp_callback.c