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/work.c

@@ -55,7 +55,6 @@ work(void)
     struct lndstr land;
     int work_amt, eff_amt, w;
     s_char *p;
-    extern int land_mob_max;
     coord donex = 0, doney = 1;
     s_char buf[1024];