[Bug libstdc++/51906] thread lock test failures on darwin11 under Xcode 4.2

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51906

--- Comment #55 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-02-07 
09:21:13 UTC ---
this should be fixed now - I won't close it until someone can verify it on
darwin