* tty.cc (tty::create_inuse): Eliminate unneeded argument.

* tty.h: Reflect above change.
* fhandler_tty.cc: Reflect argument reduction in tty::create_inuse, throughout.
Always make inuse inheritable.

winsup/cygwin/tty.h

@@ -100,7 +100,7 @@ public:
   BOOL was_opened;	/* True if opened at least once. */
 
   void init ();
-  HANDLE create_inuse (const char *, BOOL);
+  HANDLE create_inuse (const char *);
   BOOL common_init (fhandler_pty_master *);
   BOOL alive (const char *fmt);
   BOOL slave_alive ();