Relying on stdint.h in krb5

Greg Hudson ghudson at MIT.EDU
Sat Feb 1 16:56:48 EST 2014 currently says
"The C99 stdint.h or inttypes.h capabilities should be available."

I would like to change this to specifically require stdint.h, so that we
can include it unconditionally in public headers.  C99 specifies
<stdint.h> to declare the fixed-width typedefs and min/max constants,
and <inttypes.h> to declare those as well as the printf format
specifiers and some utility functions.  Right now we only need the
fixed-width type names; we don't need any of the extra stuff in

According to my notes, MSVC provides <stdint.h> as of SDK 7.1, but not
<inttypes.h>.  I believe <stdint.h> is available on every Unix-like
platform we would want to support.

I've prototyped some changes at which get rid of a
bunch of autoconf goo and use standard names for 64-bit types.

I would also like to stop using (but continue declaring)
krb5_int32/krb5_ui_4/krb5_int16/krb5_ui_2 in favor of
int32_t/uint32_t/int16_t/uint16_t, but that's a big change, so I'm going
to defer it until I see how this discussion goes.

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