extras/tools: disable contrib compilation of gpg-error, gcrypt and lua since we don't use it for now

macosx: Update Sparkle Appcast URL as we won't provide fat binaries for the foreseeable future anymore

This reverts commit ce972e18.

No functionnal change

See http://wiki.xiph.org/Chapter_Extension

If DSOUND.DLL is unavailable, just fail fast.

Signed-off-by: Rafaël Carré <funman@videolan.org>

We can't keep the cc decoder serialized with video decoder.
If the decoding delay between packetizer and video decoder is bigger
than caching (for example when using multi threaded decoder), we will
be too late for the next picture display while we wait for the right
rendering time for the CC.

Close #9049

Fix needed after b71c85b3
Encoders should use i_visible_width / i_visible_height

Refs #9147

Pointed by BtbN on IRC