[sr #110399] turning off preference for newest supported C?

Follow-up Comment #5, sr #110399 (project autoconf):

> the Gnulib stdint module assumed that AC_INCLUDES_DEFAULT was being called
> and that it set ac_cv_header_inttypes_h and ac_cv_header_sys_types_h.
> This assumption is no longer true in Autoconf 2.70

AC_INCLUDES_DEFAULT (when called without arguments) does still do
AC_CHECK_HEADERS_ONCE for both sys/types.h and inttypes.h.  See
https://git.savannah.gnu.org/cgit/autoconf.git/tree/lib/autoconf/headers.m4#n324
.  I don't know what changed exactly, but I'd guess AC_INCLUDES_DEFAULT
somehow isn't getting called in the first place.

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