Fix clock_gettime presence detect on FreeBSD.
For non-Linux, _POSIX_C_SOURCE and friends restrict symbols defined rather than enabling defines of symbols. Additionally, CLOCK_MONOTONIC was apparently added to the standard around 2000 anyway, not 1993.
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@ -722,7 +722,9 @@ if ! test "x$have_clock_gettime" = xno; then
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LIBS="$CLOCK_LIBS"
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AC_RUN_IFELSE([
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#ifdef __linux__
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#define _POSIX_C_SOURCE 199309L
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#endif
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#include <time.h>
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int main(int argc, char *argv[[]]) {
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