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/subs/nstr.c

@@ -258,7 +258,7 @@ decode(natid cnum, long int code, void *addr, int type)
 	    val = yrel(np, val);
 	    break;
 	default:
-	    logerror("bad type in decode: %x!\n", code & NSC_TMASK);
+	    logerror("bad type in decode: %lx!\n", code & NSC_TMASK);
 	    val = 0;
 	    break;
 	}