* enable sdk on contrib again

- mozilla: reduce the number of supported mime-types to avoid clashing with other plugins (Win32 & MacOS X only)

  refs #880

(there might be other occurences of the same problem)
closes #880

  This might not fix it, but it surely should eleviate the problem.

* Don't hide if the mousepointer is over the fspanel

 * skins2/src/generic_layout.cpp: Fixed an old memory leak

* update x264 to revision 604 and disable the usage of a custom nasm. Removed my patch which was disabling SSE2. (basically back-porting [18212])

fixes #878

- direct3d: partial fix for i420->rgb conversion on little endian CPU (proper fix should go in i420_rgb converter)

(fixes #789)