tests: Fix t-gettime for a time_t of 64 and a long of 32 bit.
* configure.ac (AC_CHECK_HEADERS): Add stdint.h. * common/t-gettime.c: Include stdint.h. (UINTMAX_C): Define replacement. (test_isotime2epoch): Use UINTMAX_C for the >32 bit constants.
This is for example the case on 32 bit OpenBSD.
- Signed-off-by: Werner Koch <wk@gnupg.org>