[v3] c++0x <mutex> and <condition_variable>

[Paolo Carlini]

Paolo Carlini wrote:
> + in case the test relies on the new gthread support, we need a new 
> dg-require very similar to the one I added for the atomic builtins 
> (look for check_v3_target_atomic_builtins) checking that 
> <bits/c++config.h> defines _GLIBCXX_HAS_GTHREADS. Likewise for any 
> other feature required for the correct build and run of the test 
> (__GTHREAD_HAS_COND?!?). Really rather mechanical additions.
Also, careful with int64_t, must be protected by the dg-require-cstdint...

Paolo.