Make handle_destroy and output_repaint_timer_handler static

include/sway/output.h

@@ -78,8 +78,6 @@ typedef void (*sway_surface_iterator_func_t)(struct sway_output *output, struct
 	struct wlr_surface *surface, struct wlr_box *box, float rotation,
 	void *user_data);
 
-int output_repaint_timer_handler(void *data);
-
 void output_damage_whole(struct sway_output *output);
 
 void output_damage_surface(struct sway_output *output, double ox, double oy,

sway/desktop/output.c

@@ -507,7 +507,7 @@ static bool scan_out_fullscreen_view(struct sway_output *output,
 	return wlr_output_commit(wlr_output);
 }
 
-int output_repaint_timer_handler(void *data) {
+static int output_repaint_timer_handler(void *data) {
 	struct sway_output *output = data;
 	if (output->wlr_output == NULL) {
 		return 0;

sway/desktop/surface.c

@@ -5,7 +5,7 @@
 #include "sway/server.h"
 #include "sway/surface.h"
 
-void handle_destroy(struct wl_listener *listener, void *data) {
+static void handle_destroy(struct wl_listener *listener, void *data) {
 	struct sway_surface *surface = wl_container_of(listener, surface, destroy);
 
 	surface->wlr_surface->data = NULL;