* ./include/video.h: moved vout_CopyPicture out of the way, an inline
    function did not make sense here.
  * ./include/video.h: moved vout_ChromaCmp out of the way.
  * ./plugins/avi/fourcc.h, ./include/video.h: merged these two files into
    video.h.
  * ./include/os_specific.h: this file is now always included.
  * ./include/debug.h: removed this file which was almost useless, and moved
    ASSERT to common.h.
  * ./include/common.h: fixed vlc_memalign and changed its prototype to
    follow posix_memalign's.