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[patch] Fix two small <mutex> issues


The first change works around a compiler error in <mutex> in c++1y
mode, I think it's a front end bug (reported as PR 57573) but is easy
to solve with this change.

The second changes a test to avoid calling try_lock() when the calling
thread already owns the mutex, but moving the try_lock() call into a
new thread.

        * include/std/mutex (call_once): Remove parentheses to fix error in
        c++1y and gnu++1y mode.
        * testsuite/30_threads/mutex/try_lock/2.cc: Call try_lock() in new
        thread to avoid undefined behaviour.

Tested x86_64-linux, committed to trunk.

Attachment: patch.txt
Description: Text document


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