[v3] libstdc++/50196 - enable std::thread, std::mutex etc. on darwin

[Jonathan Wakely]

Plus this bit, which I didn't include in my 'svn diff' command for the
last patches:

        * testsuite/30_threads/unique_lock/cons/5.cc: Likewise.
        * testsuite/30_threads/unique_lock/cons/6.cc: Likewise.
        * testsuite/30_threads/unique_lock/locking/3.cc: Likewise.
        * testsuite/30_threads/unique_lock/locking/4.cc: Likewise.

The patch has kindly been tested by Dominique Dhumieres on
x86_64-darwin and works as intended. There are a number of failures in
the 30_threads tests due to PR 50598, which didn't affect libstdc++
previously because the 30_threads tests were all disabled as
unsupported.
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