Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

This should fix a crash whereby VLM is deleted before its child
VOD server object.

Also disable the sub-standard FL32 -> FI32 converter.

the newly used API was introduced in OS X 10.5, while we still tried to use an older one

note that optical audio output is completely untested

Close #5019
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

In practice, this probably will not link properly even if the
pkg-config --static parameter is forced, except on Windows.

Unfortunately, we cannot emit NEON opcodes when NEON is not explicitly
enabled (-mfpu=neon), contrary to MMX & SSE on x86. As a consequence,
this will not work for inline assembler in a non-optimized plugin,
namely the deinterlacer.

There is also a(n hopefully theoretical) bug whereby the compiler would
emit NEON instructions in the descriptor or activation callback of a
NEON plugin. This could then crash if NEON is not supported, even
before the NEON run-time check is reached.