gnutls: link against CoreFoundation and the Security frameworks as it is required by the keychain certificate lookup patch

This fixes issues where video window just disappears when exiting fullscreen,
only on Mavericks.

close #9814

This precedes libcompat before the system libraries to be able to use
10.7 compiled binaries on 10.6.

close #9527

This makes it much easier to tell which codec ID mappings are missing
(or intentionally skipped).

Comments have been added for each codec ID that is currently missing.

Ordering between codecs with the same avcodec ID or VLC fourcc has been
preserved.

No functional change.
Signed-off-by: Rafaël Carré <funman@videolan.org>

Also give them VLC_CODEC_ names and use them in the adpcm decoder.

v2: Add codec description strings
Signed-off-by: Rafaël Carré <funman@videolan.org>

Also remove bogus RGBA masks. Masks are only used for RGB formats - the
VLC chromas without implicitly fixed masks.