configure.ac: check 'tv_nsec' field in 'struct stat'
Detect 'tv_nsec' field in 'struct stat' and set Makefile variable NO_NSEC appropriately. A side-effect of the above detection is that we also determine whether 'stat.st_mtimespec' is available, so, as a bonus, set the Makefile variable USE_ST_TIMESPEC, as well. Signed-off-by: NReuben Hawkins <reubenhwk@gmail.com> Helped-by: NEric Sunshine <sunshine@sunshineco.com> Reviewed-by: NEric Sunshine <sunshine@sunshineco.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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