libweston/launcher: use C99 initializers for the iface(s)

Makes the code easier to read and browse through.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
diff --git a/libweston/launcher-weston-launch.c b/libweston/launcher-weston-launch.c
index 0383550..930f4e0 100644
--- a/libweston/launcher-weston-launch.c
+++ b/libweston/launcher-weston-launch.c
@@ -291,11 +291,11 @@
 }
 
 const struct launcher_interface launcher_weston_launch_iface = {
-	launcher_weston_launch_connect,
-	launcher_weston_launch_destroy,
-	launcher_weston_launch_open,
-	launcher_weston_launch_close,
-	launcher_weston_launch_activate_vt,
-	launcher_weston_launch_restore,
-	launcher_weston_launch_get_vt,
+	.connect = launcher_weston_launch_connect,
+	.destroy = launcher_weston_launch_destroy,
+	.open = launcher_weston_launch_open,
+	.close = launcher_weston_launch_close,
+	.activate_vt = launcher_weston_launch_activate_vt,
+	.restore = launcher_weston_launch_restore,
+	.get_vt = launcher_weston_launch_get_vt,
 };