[patch libstdc++] Add POSIX variant of shared_timed_mutex.

[Torvald Riegel]

[Resend.  Sorry for the noise on gcc@.]

This adds a POSIX-based implementation of shared_timed_mutex, using
pthread_rwlock_* operations directly instead of implementing with
mutexes and two condvars.  This enables using an optimized
pthread_rwlock_t on POSIX.

Tested on x86_64-linux.

OK?

2015-01-16  Torvald Riegel  <triegel@redhat.com>

	* include/std/shared_mutex (shared_timed_mutex): Add POSIX-based
	implementation.


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