fix _POSIX_SYNCHRONIZED_IO usage
it can be -1 for unsupported, or 0 for runtime detection (which we don't do).
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@ -43,7 +43,7 @@
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# define LEGACY_FLOCK 1
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#endif
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#ifndef _POSIX_SYNCHRONIZED_IO
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#if !defined(_POSIX_SYNCHRONIZED_IO) || _POSIX_SYNCHRONIZED_IO <= 0
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# define fdatasync fsync
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#endif
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@ -35,7 +35,7 @@
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#include <errno.h>
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#include <sys/stat.h>
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#ifndef _POSIX_SYNCHRONIZED_IO
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#if !defined(_POSIX_SYNCHRONIZED_IO) || _POSIX_SYNCHRONIZED_IO <= 0
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# define fdatasync fsync
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#endif
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