lavc is much faster on ARMv7.

62eefa47 introduced the same hack for
DTS already a while ago. This allows falling back to lavc gracefully.

Seems like it got cut off in the copy from Miredo.

As a side effects, window resize is now implemented.

It is needed as long as we cannot directly get an opengl context
from a vout_thread_t.

macosx/framework: fixed MPEG2 exporting, updated iPod video profile (requires contribs with mp4a encoder) and added a method to stop all this

PPM image format is already supported in FFMPEG. It would be possible to
support it in vlc too with the following patch.
The targetted usage of this change is to be able to do:
vlc --fake-file image.ppm fake://
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

and stretch the search to 1 in the playlist

(refs #1672, 5dca2e33)