gtk+3: if built with wayland option, propagate libxkbcommon-devel in -devel pkg.

srcpkgs/gtk+3/template

@@ -1,7 +1,7 @@
 # Template build file for 'gtk+3'.
 pkgname=gtk+3
 version=3.8.1
-revision=2
+revision=3
 wrksrc="gtk+-${version}"
 build_style=gnu-configure
 configure_args="--enable-cups --disable-schemas-compile
@@ -68,7 +68,7 @@ gtk+3-devel_package() {
 		depends+=" libXcomposite-devel libXcursor-devel libXrandr-devel libXi-devel libXinerama-devel"
 	fi
 	if [ "$build_option_wayland" ]; then
-		depends+=" wayland-devel"
+		depends+=" libkbcommon-devel wayland-devel"
 	fi
 	short_desc+=" - development files"
 	pkg_install() {