It allows to be sure to avoid infinite ping-pong between
VOUT_DISPLAY_CHANGE_DISPLAY_SIZE and VOUT_DISPLAY_EVENT_DISPLAY_SIZE in
some corner cases or broken "vout window".

fix a deadlock where the thread would be cancelled while still holding
message bank lock

contrib: updated fontconfig to 2.7.3 and changed the download link to ganesh as the official server isn't reliable

The files have been added back.
This reverts commit 61e0cee0.

This reverts commit fd4cb488.

We don't need this commit if we don't use posix_memalign().

This is significantly slower than malloc().

Main loop now burns 3 cycles per 8 values, if I compute right.
This is not quite main bottleneck, but it is pretty much always used
(since we output 16-bits PCM).

AVI demuxer now also check the number of frames from the index and the
avi header.

Thanks MSJ for the report on the forum.

audio_format handles all conversion between integer and float formats,
but none of the conversions from/to fixed-point.

This partially reverts commit 7cde22ed.

 * It did not fix the issue with UDP packet loos that brought it in the
   first place (#1919, it was a socket buffer issue),
 * It does not play nice with posix_memalign(),
 * It is slow.

In particular, this fixes invalid memory use when downsampling
with the "trivial" plugin.