https://gitlab.synchro.net/main/sbbs/-/commit/8f2102a7f68f4c30d377722d
Modified Files:
	src/sbbs3/ftpsrvr.c main.cpp nopen.c nopen.h
Log Message:
Leave the user/*.ftp lock file open for better protection

This appears to be the only way to 100% provide mutual exclusivity between
Windows and Linux client sharing a Samba file system.

Also, make fmutex_close() take a pointer to the file descriptor so that we can
better manage the resource (i.e. don't close a descriptor that's already been
closed and possibly valid in another thread).
--- SBBSecho 3.22-Linux