Moved sex_change_ok to instance_globals.

include/decl.h

@@ -464,6 +464,11 @@ struct instance_globals {
     /* pickup.c */
     int oldcap; /* last encumberance */
 
+    /* polyself.c */
+    int sex_change_ok; /* controls whether taking on new form or becoming new
+                          man can also change sex (ought to be an arg to
+                          polymon() and newman() instead) */
+
     /* potion.c */
     boolean notonhead; /* for long worms */
     int potion_nothing;