[gtk-osx-devel] Update stable Gtk3.

[John Ralls <jralls ceridwen us>]

Having spent the last couple of days fixing some crasher bugs in 3.10, I was half-pleased to see that 
Matthias released 3.10.1 today... but I would have been happier if he'd waited until tomorrow! Since he 
didn't, I've changed the stable moduleset to use 3.10.1 and added the patches I committed today.

Since the 3.10.0 release has some significant issues, particularly crashing in DnD because of an 
unimplemented function, it would be wise to rebuild with 3.10.1 right away.

Regards,
John Ralls