Bugzilla bug 266327: support PR_EXCL in _MD_open for BeOS.  The patch is contributed by Niels Reedijk <Niels.Reedijk@gmail.com>. r=simontaylor2,wtc.
Bugzilla bug 266327: support PR_EXCL in _MD_open for BeOS.  The patch is
contributed by Niels Reedijk <Niels.Reedijk@gmail.com>. r=simontaylor2,wtc.

makotokato/nsprpub,makotokato/nsprpub,makotokato/nsprpub,makotokato/nsprpub,makotokato/nsprpub