* path.cc (is_floppy): Make externally available.

* path.h (is_floppy): Declare.
	* syscalls.cc (sync): Check for floppies on A: and B: in guid case.
	Don't call setmntent in non-guid case but evaluate drive bit mask
	locally.

winsup/cygwin/path.h

@@ -274,6 +274,8 @@ bool fnunmunge (char *, const char *) __attribute__ ((regparm (2)));
 
 int path_prefix_p (const char *path1, const char *path2, int len1) __attribute__ ((regparm (3)));
 
+bool is_floppy (const char *);
+
 /* FIXME: Move to own include file eventually */
 
 #define MAX_ETC_FILES 2