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/commands/mobq.c

@@ -47,9 +47,6 @@
 int
 mobq(void)
 {
-    extern int ship_mob_max;
-    extern float ship_mob_scale;
-    extern int etu_per_update;
     struct shpstr ship;
     s_char *cp, *oldmq;
     int good, mobquota, count = 0;