arogue5: fix a typo that broke compilation with GCC 5.

"msg" had been used instead of "msgw".  I'm not sure why neither GCC 4
nor MSVC caught this.

arogue5/things.c

@@ -701,7 +701,7 @@ int thing_type;
 	    }
 	otherwise:
 	    debug("Picked a bad kind of object");
-	    wait_for(msg,' ');
+	    wait_for(msgw,' ');
     }
     return item;
 }