Fix XGetWindowProperty() usage on LP64 archs.

Based on a submission by Alessandro De Laurenzis.

x11/wmctrl/Makefile

@@ -1,8 +1,8 @@
-# $OpenBSD: Makefile,v 1.21 2019/07/12 20:51:24 sthen Exp $
+# $OpenBSD: Makefile,v 1.22 2020/05/15 16:51:26 naddy Exp $
 
 COMMENT=	interact with an EWMH/NetWM window manager
 DISTNAME=	wmctrl-1.07
-REVISION=	8
+REVISION=	9
 
 CATEGORIES=	x11
 MASTER_SITES=	${HOMEPAGE}

x11/wmctrl/patches/patch-main_c

@@ -0,0 +1,19 @@
+$OpenBSD: patch-main_c,v 1.1 2020/05/15 16:51:26 naddy Exp $
+
+Index: main.c
+--- main.c.orig
++++ main.c
+@@ -1439,8 +1439,12 @@ static gchar *get_property (Display *disp, Window win,
+         return NULL;
+     }
+ 
++    /* Data returned in 32-bit format is stored as long */
++    if (ret_format == 32)
++        tmp_size = sizeof(long) * ret_nitems;
++    else
++        tmp_size = (ret_format / 8) * ret_nitems;
+     /* null terminate the result to make string handling easier */
+-    tmp_size = (ret_format / 8) * ret_nitems;
+     ret = g_malloc(tmp_size + 1);
+     memcpy(ret, ret_prop, tmp_size);
+     ret[tmp_size] = '\0';