kib 5e07d49c62 The MSDOSFSMNT_WAITONFAT flag is bogus and broken. It does less than
track the MNT_SYNCHRONOUS flag.  It is set to the latter at mount time
but not updated by MNT_UPDATE.

Use MNT_SYNCHRONOUS to decide to write the FAT updates syncrhonously.

Submitted by:	bde
MFC after:	1 week
2013-02-01 18:30:41 +00:00
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