configure.ac: Fix monotonic test harder
This was only introduced in a later version of POSIX, so define that version to get it from more conformant systems.
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@ -734,7 +734,7 @@ if ! test "x$have_clock_gettime" = xno; then
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CPPFLAGS_SAVE="$CPPFLAGS"
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if test x"$glibc" = xyes; then
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CPPFLAGS="$CPPFLAGS -D_POSIX_C_SOURCE=199309L"
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CPPFLAGS="$CPPFLAGS -D_POSIX_C_SOURCE=200112L"
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fi
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AC_RUN_IFELSE([
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