arm: Mark the stack as non-executable

If linking in an object file without this attribute set, the
linker will assume that an executable stack might be needed.

Signed-off-by: Martin Storsjö <martin@martin.st>
movenc: Add a fallback fragmentation method for plain mp4 as well

Previously the default fragmentation method was only enabled
if writing an ISM file.

Signed-off-by: Martin Storsjö <martin@martin.st>
gitignore: Add all examples below doc/examples
x86: dca: Add missing multiple inclusion guards
vf_interlace: deprecate lowpass option
threads: Check w32threads dependencies at the configure stage

Also add warning comment about threading implementations without matching
atomics implementation to the atomics fallback implementation.
doc: Sort the muxer documentation

Keep the sections alphabetically sorted.
doc: Name the MOV muxer as it should be called

The section name is the muxer, not the format.
hevc: Mention the missing SPS in the error message
hevc: Always consider VLC NALU type mismatch fatal

Sample-Id: 00001667-google
Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
AVOptions: deprecate unused AV_OPT_FLAG_METADATA

It was never used since it was added and the things it was intended for
are now exported differently.
AVOptions: add flags for read/read-only options
libavformat/mpegts: expose raw packet size

We cannot easily determine if an mpeg TS's packet size is DVHS, FEC
or so on, for that we need to expose the internal raw_packet_size
field.

Signed-off-by: Anton Khirnov <anton@khirnov.net>