Declare all configuration variables in optlist.h. Include that

instead of declaring them all over the place.  This uncovered type
errors:
(s_p_etu, adj_update): Defined long, sometimes declared int.  Kills
big endian machines where sizeof(long) != sizeof(int).  Change to
int.

(set_option, delete_option, optstrset, intset, floatset, doubleset,
longset, optionset, optiondel, worldxset): Change linkage to static.

src/lib/subs/attsub.c

@@ -2608,8 +2608,6 @@ static void
 take_move_in_mob(int combat_mode, struct llist *llp, struct combat *off,
 		 struct combat *def)
 {
-    extern int etu_per_update;
-    extern float land_mob_scale;
     int mobcost;
     int new;