ace: fix segfaults on base-clang archs by adding a missing header

Spotted by and OK solene@

games/ace/Makefile

@@ -1,9 +1,9 @@
-# $OpenBSD: Makefile,v 1.4 2019/07/12 20:46:14 sthen Exp $
+# $OpenBSD: Makefile,v 1.5 2019/10/02 21:11:08 cwen Exp $
 
 COMMENT =		solitaire games
 
 DISTNAME =		ace-1.4
-REVISION =		0
+REVISION =		1
 
 SHARED_LIBS +=  cards                     0.0 # 1.0
 

games/ace/patches/patch-lib_imagelib_c

@@ -0,0 +1,13 @@
+$OpenBSD: patch-lib_imagelib_c,v 1.1 2019/10/02 21:11:08 cwen Exp $
+
+Fix segfault on clang archs
+
+Index: lib/imagelib.c
+--- lib/imagelib.c.orig
++++ lib/imagelib.c
+@@ -1,4 +1,5 @@
+ #include <stdio.h>
++#include <stdlib.h>
+ #include <string.h>
+ #include "imagelib.h"
+ #include "cards.h"