puzzles: unbreak on archs where char is unsigned by default (ppc, arm)

OK landry@

games/puzzles/Makefile

@@ -1,8 +1,9 @@
-# $OpenBSD: Makefile,v 1.18 2019/07/12 20:46:23 sthen Exp $
+# $OpenBSD: Makefile,v 1.19 2019/08/19 18:12:31 cwen Exp $
 
 COMMENT =	collection of puzzles games
 
 DISTNAME =	puzzles-20190415
+REVISION =	0
 CATEGORIES =	games
 
 MASTER_SITES =	https://rhaalovely.net/stuff/

games/puzzles/patches/patch-palisade_c

@@ -0,0 +1,18 @@
+$OpenBSD: patch-palisade_c,v 1.1 2019/08/19 18:12:31 cwen Exp $
+
+Fix for archs where char is unsigned by default (ppc, arm):
+error: result of comparison of constant -1 with expression of type
+'clue' (aka 'char')
+
+Index: palisade.c
+--- palisade.c.orig
++++ palisade.c
+@@ -46,7 +46,7 @@ struct game_params {
+     int w, h, k;
+ };
+ 
+-typedef char clue;
++typedef signed char clue;
+ typedef unsigned char borderflag;
+ 
+ typedef struct shared_state {