Mac OS X gui: Fix a double unlock issue, by making sure all timers are disabled when checking if we have to unlock. (Pointed by Felix Paul Kuhne)

* fixed support for future darwin releases on Intel. SDL, goom, gnutls and libpng still need to be fixed on both platforms.

- Fix illegal error return value for getnaminfo from [18812]
- Do not crash if the APIs are not available (*NULL) from [18812]

Should fix most Win32 resolution crashes
(if not already done in previous commits)

Mac OS X gui: Use a recursive lock to be able to trigger enter/leaveFullscreen in the middle of an enter/leaveFullscreen operation.

This is bound to crash.

Close the embedded window only when playlist stop. Have the window to animate smoothly when size changes. Make the fullscreen mode behaves well when input changes and ends.

As a side effect, this workaround the AAC decoding problem after pause/seek
when going through our packetizer (eg: pause/seek with vlc VOD).

But the bug is still there : faad will stop decoding audio forever after
receiving a buffer full of 0 (at least with faad2-2.5 from
audiocoding.com, faad2 from mplayer svn does not show this problem)

as soon as possible to allow decoders to flush (well that part need to
be implemented ;)

You have to use sout-keep option on your broadcast media using 
 > setup your_media option sout-keep
The default value is no-sout-keep and command line option --sout-keep
will not activate it (on purpose).

of libvlc-control (what's that ?).
 It will need to be rewritten when VLM API is fixed.

* added ugly, but working support for future, powerpc-based darwin releases. this doesn't support intel-Macs yet

- Do not use non-thread-safe stuff