[Bug other/53889] Gthreads doesn't support destroying recursive mutexes

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53889

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-07-07 
18:50:29 UTC ---
Created attachment 27760
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27760
Add __gthread_recursive_mutex_destroy.

Untested.