weston: Make the shell entrypoint specific

This avoids loading a shell as a module, so we are sure to have only one
shell loaded at a time.

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
Reviewed-by: Daniel Stone <daniels@collabora.com>

fullscreen-shell/fullscreen-shell.c

@@ -897,8 +897,8 @@ bind_fullscreen_shell(struct wl_client *client, void *data, uint32_t version,
 }
 
 WL_EXPORT int
-wet_module_init(struct weston_compositor *compositor,
-		int *argc, char *argv[])
+wet_shell_init(struct weston_compositor *compositor,
+	       int *argc, char *argv[])
 {
 	struct fullscreen_shell *shell;
 	struct weston_seat *seat;