[Bug c/83294] int32_t & related definitions wrong with -funsigned-bitfields

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83294

--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
FWIW C++ Core DR 739 is a DR against C++11 and C++98, so should be considered
to apply pre-C++14 too.

http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#739

This has no bearing on the C behaviour though.