[v3] c++0x <thread>

[Paolo Carlini]

Chris Fairles wrote:
> Added dg-require-nanosleep.
>   
Good idea. Some time ago we actually came to the conclusion that 
essentially we should *always* use the dg-require mechanism to skip 
tests, it's the only consistent and neat way to deal with unsupported 
features in the testsuite. However... at some point we should probably 
figure out a way to commonize the code of the check_v3_target_*, seems 
definitely doable for those simply checking a macro set at configure time...

Anyway, I'm going to regtest -m32 / -m64 your last patch (just arrived) 
and commit in case of success... Keep an eye, as usual, to small nits on 
less widespread targets...

Thanks!
Paolo.