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/mfir.c

@@ -780,7 +780,6 @@ quiet_bigdef(int attacker, struct emp_qelem *list, natid own, natid aown,
     struct sctstr firing;
     struct nstr_sect ns;
     struct flist *fp;
-    extern int torpedo_damage;
     int gun;
 
     if (own == 0)