inttypes.h included wchar.h for wchar_t and stdint.h, but this created
a circular dependency: wchar.h → stdint.h → gnulib inttypes.h →
inttypes.h → wchar.h. When gnulib's wchar.h wrapper was re-entered
during this cycle, wint_t and mbstate_t were not yet defined.
POSIX spec says inttypes.h should include stdint.h directly and
wchar_t comes from stddef.h. Using stdint.h + stddef.h breaks the
circular chain at its source.
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