community/xfwm4: fix xi2 mask length

This fixes breakage uncovered by musl 1.1.20 upgrade.

community/xfwm4/APKBUILD

@@ -2,7 +2,7 @@
 # Maintainer: Natanael Copa <ncopa@alpinelinux.org>
 pkgname=xfwm4
 pkgver=4.13.1
-pkgrel=1
+pkgrel=2
 pkgdesc="Xfce window manager, compatible with Gnome, Gnome2, KDE2, and KDE3"
 url="https://xfce.org/"
 arch="all"
@@ -13,7 +13,9 @@ makedepends="libxfce4ui-dev libwnck3-dev libxrandr-dev libxcomposite-dev
 	libxfixes-dev libxdamage-dev libxrender-dev libepoxy-dev dbus-glib-dev
 	libxpresent-dev"
 install=
-source="http://archive.xfce.org/src/xfce/xfwm4/${pkgver%.*}/xfwm4-$pkgver.tar.bz2"
+source="http://archive.xfce.org/src/xfce/xfwm4/${pkgver%.*}/xfwm4-$pkgver.tar.bz2
+	fix-mask-length.patch
+	"
 
 build () {
 	cd "$builddir"
@@ -41,4 +43,5 @@ package() {
 	cd "$builddir"
 	make DESTDIR="$pkgdir" install
 }
-sha512sums="2ac5acdefff3a89b8525719b345dfeb2dc71104b4da341afe99d7c57c049753c4cdb81a512d1f344e5fb463c7143673e83316b63888777bdcf254c4a07ca8320  xfwm4-4.13.1.tar.bz2"
+sha512sums="2ac5acdefff3a89b8525719b345dfeb2dc71104b4da341afe99d7c57c049753c4cdb81a512d1f344e5fb463c7143673e83316b63888777bdcf254c4a07ca8320  xfwm4-4.13.1.tar.bz2
+88733a4d69b58b0c98f2f46694ccc8bda4e5bc1b565d952123cee466b3f89f95d72fc28c8e9c173dcc0aee606c9f4b085d891004d769b74ad0c7084d8dec00a9  fix-mask-length.patch"

community/xfwm4/fix-mask-length.patch

+diff -ru xfwm4-4.13.1.orig/src/device.c xfwm4-4.13.1/src/device.c
+--- xfwm4-4.13.1.orig/src/device.c	2018-07-29 16:08:54.000000000 +0300
++++ xfwm4-4.13.1/src/device.c	2018-09-12 08:49:18.130254993 +0300
+@@ -301,7 +301,7 @@
+     guint i;
+ 
+     xievent_mask->deviceid = XIAllMasterDevices;
+-    xievent_mask->mask_len = sizeof (mask);
++    xievent_mask->mask_len = len;
+     xievent_mask->mask = mask;
+ 
+     for (i = 0; i < G_N_ELEMENTS (core_to_xi2); i++)