[PATCH] Change __INT*_TYPE__ to be compatible with GCC

[Joerg Sonnenberger]

Hi all,
at the moment, users of __INT8_TYPE__ are expected to prefix it with an
explicit signed. We recently got support for __UINTx_TYPE__, so the
primary reason for that odity disappeared. I'd like to make our macros
compatible with the simpler GCC definition, so that __INT8_TYPE__ is
signed char and the others can be defined without signed. This
potentially breaks out of tree users of __INTx_TYPE__, so I would like
to get a consensus here first.

stdint.h and co should be cleaned up separately to use the builtin macros
more aggressively, but that's a somewhat unrelated issue.

Joerg
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