[v3] libstdc++/49745 (review required for the gthr-posix.h changes)

[Paolo Carlini]

Hi,

this is what I did in terms of implementing Jon's and Jakub's 
suggestions: many thanks to both of you!

The patch should be in general quite conservative and safe, in 
particular, the gthr-posix.h changes, which I cannot approve myself, 
touch bits only used by libstdc++-v3 + the macro avoiding the 
unconditional inclusion of <unistd.h>, which, according to Jakub's 
analysis, should be required only by objc.

I built and tested c++ and its lib and built all languages.  Ok?

Thanks,
Paolo.

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