libweston-desktop: Implement xdg_shell_v6

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
Reviewed-by: Jonas Ådahl <jadahl@gmail.com>
Acked-by: Giulio Camuffo <giulio.camuffo@kdab.com>

Differential Revision: https://phabricator.freedesktop.org/D1210
diff --git a/configure.ac b/configure.ac
index b45d0e2..fe65bda 100644
--- a/configure.ac
+++ b/configure.ac
@@ -194,7 +194,7 @@
 PKG_CHECK_MODULES(LIBINPUT_BACKEND, [libinput >= 0.8.0])
 PKG_CHECK_MODULES(COMPOSITOR, [$COMPOSITOR_MODULES])
 
-PKG_CHECK_MODULES(WAYLAND_PROTOCOLS, [wayland-protocols >= 1.4],
+PKG_CHECK_MODULES(WAYLAND_PROTOCOLS, [wayland-protocols >= 1.7],
 		  [ac_wayland_protocols_pkgdatadir=`$PKG_CONFIG --variable=pkgdatadir wayland-protocols`])
 AC_SUBST(WAYLAND_PROTOCOLS_DATADIR, $ac_wayland_protocols_pkgdatadir)