configure.ac: check for clock_gettime and CLOCK_MONOTONIC
Set or clear Makefile variables HAVE_CLOCK_GETTIME and HAVE_CLOCK_MONOTONIC based upon results of the checks (overriding default values from config.mak.uname). CLOCK_MONOTONIC isn't available on RHEL3, but there are still RHEL3 systems being used in production. Signed-off-by: NReuben Hawkins <reubenhwk@gmail.com> Reviewed-by: NEric Sunshine <sunshine@sunshineco.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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