[v3] parallel mode use cstdint

[Benjamin Kosnik]

First in a series of 3 patches fixing parallel mode settings. This was
originally posted as part of libstdc++/34797: I'm breaking it into
three pieces and posting individually.

This patch uses stdint's int64_t instead of the current
__gnu_parallel::int64, et. al. By doing this, we have consistent type
usage across C/C++, with the downside of having std::tr1 injected when
using parallel mode. I think the removal of "sound alike" typedefs
outweighs the (slight) disadvantage.

-benjamin

tested x86/linux
tested x86/linux parallel mode
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