[v3] -fno-exceptions cleanups

[Benjamin Kosnik]

> The __throw_future_error function needs to be guarded by
> 
> #if defined(_GLIBCXX_HAS_GTHREADS) &&
> defined(_GLIBCXX_USE_C99_STDINT_TR1) \ &&
> defined(_GLIBCXX_ATOMIC_BUILTINS_4)
> 
> or future_error and future_errc need to be moved outside the guard and
> defined unconditionally.

Here.

tested x86_64/linux
tested x86_64/linux --disable-threads

-benjamin
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