avutil: Remove (broken) CPU detection on android

libavutil does what we do already
release-howto: Explicitely select VideoLAN signing key
macosx: fix compilation on snow leopard by not using [] syntax for arrays
macosx: avoid NS_ENUM to fix compilation on snow leopard
macosx: check for NSByteCountFormatter on runtime, to fix compilation on snow leopard

Defining the category to a nonexisting class is not allowed, as well as providing
an interface for this class without implementation.
macosx: comment custom lion fullscreen mode on snow leopard

NSFullScreenWindowMask is not defined here.
DirectSound: use calloc for aout_stream_sys_t

Fix a crash occurring when CreateDSBufferPCM() fails in Start() and
afterwards Stop() uses uninitialized pointer values when releasing
objects.

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>
DirectSound: avoid double call to release function

If Start() failed, IDirectSound_Release() was called twice.

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net> with changes
Revert "auhal: rework channel mapping for analog surround output"

This reverts commit c3bb23cd68f36ea37cf8d6ecb7cc187cd47c1c38.
Revert "auhal: fix wrong analog 5.1 channel ordering (close #8589)"

This is superseded by a proper fix.
This reverts commit fa396d194fa58097223475d8038605f10a5041c5.
auhal: simplify switch by mapping with an array
auhal: correctly fix channel ordering by setting the correct scope.

fixes #10125, #10199
auhal: rename layout variable to make more clear that this is the input layout
mmdevice: add missing initializer (fixes #10775)
Merge remote-tracking branch: upstream/master