[patch] libstdc++/65704 portable timed_mutex and recursive_timed_mutex

[Jonathan Wakely]

On 04/09/15 11:18 +0100, Jonathan Wakely wrote:
>This provides alternative implementations of std::timed_mutex and
>std::recursive_timed_mutex for targets that don't support the
>_POSIX_TIMEOUTS option (darwin and maybe HPUX).

Committed to trunk now.