DOS bits

On some MSDOS ports, STATIC_OVL doesn't equate
to static, so taking_off in do_wear.c conflicts with the
one in invent.c in those environments.  Somebody
out there might wish to try and build the 16 port and
tune it to work properly someday.

src/do_wear.c

@@ -10,7 +10,8 @@ STATIC_DCL long takeoff_mask, taking_off;
 
 #else /* OVLB */
 
-STATIC_OVL NEARDATA long takeoff_mask = 0L, taking_off = 0L;
+STATIC_OVL NEARDATA long takeoff_mask = 0L;
+static taking_off = 0L;
 
 static NEARDATA int todelay;
 static boolean cancelled_don = FALSE;