libweston: Put back weston_compositor_add_debug_binding() as public

The ability to install debug keybinds is useful so bring it back to the
public libweston API.

Signed-off-by: Marius Vlad <marius.vlad@collabora.com>

include/libweston/libweston.h

@@ -1627,6 +1627,11 @@ weston_compositor_add_key_binding(struct weston_compositor *compositor,
 				  enum weston_keyboard_modifier modifier,
 				  weston_key_binding_handler_t binding,
 				  void *data);
+struct weston_binding *
+weston_compositor_add_debug_binding(struct weston_compositor *compositor,
+				    uint32_t key,
+				    weston_key_binding_handler_t binding,
+				    void *data);
 
 typedef void (*weston_modifier_binding_handler_t)(struct weston_keyboard *keyboard,
 					          enum weston_keyboard_modifier modifier,

libweston/libweston-internal.h

@@ -79,11 +79,6 @@ weston_compositor_add_head(struct weston_compositor *compositor,
 void
 weston_compositor_add_pending_output(struct weston_output *output,
 				     struct weston_compositor *compositor);
-struct weston_binding *
-weston_compositor_add_debug_binding(struct weston_compositor *compositor,
-				    uint32_t key,
-				    weston_key_binding_handler_t binding,
-				    void *data);
 bool
 weston_compositor_import_dmabuf(struct weston_compositor *compositor,
 				struct linux_dmabuf_buffer *buffer);