[v3] mutex vs. cstdatomic

[Benjamin Kosnik]

> Most likely I'm saying the obvious, but certainly the above should be
> further investigated: if the facilities in <cstdatomic> explicitly
> require the facilities in <mutex>, then the latter should be included
> explicitely by the former, otherwise, if it's because of an
> implementation detail, that is <mutex> includes something that
> <cstdatomic> also happen to need and at the moment doesn't include by
> mistake, that should be also fixed ASAP.

Here's the fix, in at revision 142742.

-benjamin

Tested x86_64/linux
tested x86/darwin9.5.0
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