* include/vlc_threads_funcs.h: add define for ETIMEDOUT on WIN32 and remove return 0 from void function vlc_spin_destroy

 - lock/unlock/signal/wait/destroy functions cannot fail unless there is a bug,
   so have them return void rather than an unused int, and assert against bugs.
 - Fix a few corner case minor bugs.
 - Use fprintf() rather than msg_Err() to avoid infinite recursions.

causing segfault on Windows platform

macosx/vlc_app: Access meta via valueForKeyPath: to make sure we trigger art work fetching. We may change the metaDictionary a bit to prevent non trapped access.

* modules/codec/x264.c: fix threads=0 (auto) which is the default setting for VLC but wasn't propogated to x264 which kept using its default threads=1 (thanks pengvado for spotting the problem). This fix gives a major performance boost on multi cpu systems when using the default settings.

* extras/contrib/src/Patches/x264-svn-win32.patch: revert [25113] and [25140] log x264 thread count from win32.patch and put it in a generic patch for all platforms (threads=0 autodetect for x264 is reportedly failing on win32 and linux too and always reports threads=1, though x264 cli works fine so it needs more debugging..)

* modules/codec/x264.c: more user friendly version reporting of x264 (so no more confusion x264 core:58 would mean the system has 58 cores..)

* extras/contrib/src/Patches/x264-svn-win32.patch: log x264 thread count as normal info instead of needing debug (extreme logging needing verbose option)

macosx: implemented the Video category of the SimplePrefs panel. vout module and display device selectors are left as an exercise for the reader.