Use gcc function attribute `format' to catch bad format strings. Fix

them.  From Marc Olzheim.
Type modifier 'l' was missing in many places, probably rendering the
server useless on 64-bit hosts.
(ef_flush, ef_write, ef_extend, lwpCreate, lwpDestroy): Use conversion
specifier 'p' to print pointers.
(check_market): Fix display of loan amount.
(doland): Fix unescaped '%' (undefined behavior).
(ldump, ndump, pdump, sdump): Don't use flag '0' with conversion
specifier 's' (undefined behavior).
(dump, ldump, lost, ndump, pdump, sdump, empth_create, update_sched):
Cast time_t and pthread_t to long for printing.
(lwpStackCheck, lwpStackCheckUsed, finish_sects): Insert cast to fix
argument type on all platforms.
(prod): Remove extra argument.
(perform_mission, airdamage, retreat_land1, lwpReschedule): Format
string missed arguments.

src/lib/commands/shark.c

@@ -116,7 +116,7 @@ shark(void)
 	   "%s bought loan #%d.  You now owe him!\n",
 	   cname(player->cnum), arg);
 	wu(0, loan.l_loner,
-	   "%s bought loan #%d out from under you for %d\n",
+	   "%s bought loan #%d out from under you for %ld\n",
 	   cname(player->cnum), arg, payment);
 	pr("You now own loan #%d.  Go break some legs.\n", arg);
     }