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/server/update.c

@@ -81,7 +81,7 @@ update_sched(void *unused)
 	    delta += wind;
 	}
 	logerror("Next update at %s", ctime(&update_time));
-	logerror("Next update in %d seconds", delta);
+	logerror("Next update in %ld seconds", (long)delta);
 	/* sleep until update is scheduled to go off */
 	empth_sleep(update_time);
 	time(&now);