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

[Jonathan Wakely]

This patch should enable macosx support for <thread> and partial
support for <mutex>, by defining _GLIBCXX_HAS_GTHREADS on POSIX
systems without the _POSIX_TIMEOUTS option, and only disabling the
types which rely on the Timeouts option, std::timed_mutex and
std::recursive_timed_mutex, instead of disabling all thread support.

Paolo, Jakub, I'd appreciate it if you two could check this over, as
you were responsible for some of this autoconf stuff, via
http://gcc.gnu.org/PR49745

I've only tested this on x86-64-linux where everything is supported
anyway, but I did tweak the configure test for _POSIX_TIMEOUTS to
fail, so I could check the tests were correctly disabled when
_GTHREADS_HAS_MUTEX_TIMEDLOCK is zero.

If anyone can test this on darwin I'd be very grateful (you'll need to
run autoreconf in the libstdc++-v3 directory to regenerate configure
and config.h.in, or contact me and I'll mail you the regenerated
files)

ChangeLog:

        * acinclude.m4 (GTHREADS_HAS_MUTEX_TIMEDLOCK): Don't depend on
_POSIX_TIMEOUTS.
        * configure: Regenerate.
        * config.h.in: Regenerate.
        * include/std/mutex (timed_mutex, recursive_timed_mutex): Define
        conditionally on GTHREADS_HAS_MUTEX_TIMEDLOCK.
        * testsuite/lib/libstdc++.exp (check_v3_target_gthreads_timed): Define.
        * testsuite/lib/dg-options.exp (dg-require-gthreads-timed): Define.
        * testsuite/30_threads/recursive_timed_mutex/dest/destructor_locked.cc:
        Use dg-require-gthreads-timed instead of dg-require-gthreads.
        * testsuite/30_threads/recursive_timed_mutex/native_handle/
        typesizes.cc: Likewise.
        * testsuite/30_threads/recursive_timed_mutex/native_handle/1.cc:
        Likewise.
        * testsuite/30_threads/recursive_timed_mutex/try_lock_until/1.cc:
        Likewise.
        * testsuite/30_threads/recursive_timed_mutex/try_lock_until/2.cc:
        Likewise.
        * testsuite/30_threads/recursive_timed_mutex/cons/assign_neg.cc:
        Likewise.
        * testsuite/30_threads/recursive_timed_mutex/cons/1.cc: Likewise.
        * testsuite/30_threads/recursive_timed_mutex/cons/copy_neg.cc:
        Likewise.
        * testsuite/30_threads/recursive_timed_mutex/requirements/typedefs.cc:
        Likewise.
        * testsuite/30_threads/recursive_timed_mutex/try_lock/1.cc: Likewise.
        * testsuite/30_threads/recursive_timed_mutex/try_lock/2.cc: Likewise.
        * testsuite/30_threads/recursive_timed_mutex/lock/1.cc: Likewise.
        * testsuite/30_threads/recursive_timed_mutex/lock/2.cc: Likewise.
        * testsuite/30_threads/recursive_timed_mutex/unlock/1.cc: Likewise.
        * testsuite/30_threads/recursive_timed_mutex/try_lock_for/1.cc:
        Likewise.
        * testsuite/30_threads/recursive_timed_mutex/try_lock_for/2.cc:
        Likewise.
        * testsuite/30_threads/recursive_timed_mutex/try_lock_for/3.cc:
        Likewise.
        * testsuite/30_threads/timed_mutex/dest/destructor_locked.cc: Likewise.
        * testsuite/30_threads/timed_mutex/native_handle/typesizes.cc:
        Likewise.
        * testsuite/30_threads/timed_mutex/native_handle/1.cc: Likewise.
        * testsuite/30_threads/timed_mutex/try_lock_until/1.cc: Likewise.
        * testsuite/30_threads/timed_mutex/try_lock_until/2.cc: Likewise.
        * testsuite/30_threads/timed_mutex/cons/assign_neg.cc: Likewise.
        * testsuite/30_threads/timed_mutex/cons/1.cc: Likewise.
        * testsuite/30_threads/timed_mutex/cons/copy_neg.cc: Likewise.
        * testsuite/30_threads/timed_mutex/requirements/standard_layout.cc:
        Likewise.
        * testsuite/30_threads/timed_mutex/requirements/typedefs.cc: Likewise.
        * testsuite/30_threads/timed_mutex/try_lock/1.cc: Likewise.
        * testsuite/30_threads/timed_mutex/try_lock/2.cc: Likewise.
        * testsuite/30_threads/timed_mutex/lock/1.cc: Likewise.
        * testsuite/30_threads/timed_mutex/unlock/1.cc: Likewise.
        * testsuite/30_threads/timed_mutex/try_lock_for/1.cc: Likewise.
        * testsuite/30_threads/timed_mutex/try_lock_for/2.cc: Likewise.
        * testsuite/30_threads/timed_mutex/try_lock_for/3.cc: Likewise.
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