Patched GCC!

I just had a patch accepted to GCC! gcc/ada/init.c, r195862.

2013-02-07  Simon Wright  <simon@pushface.org>

 PR target/50678
 * init.c (__darwin_major_version): New function for x86-64/Darwin.
 (__gnat_adjust_context_for_raise) [Darwin]: Disable the workaround
 on Darwin 12 and above.