SDL: Make Cocoa_HandleTitleButtonEvent() static since it's not used anywhere else

From dfd3f30e88dcb4cb48635ae2a3734322b85a568c Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Tue, 27 Jul 2021 14:27:37 -0700
Subject: [PATCH] Make Cocoa_HandleTitleButtonEvent() static since it's not
 used anywhere else

---
 src/video/cocoa/SDL_cocoamouse.m | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/video/cocoa/SDL_cocoamouse.m b/src/video/cocoa/SDL_cocoamouse.m
index 5680ef58c..e9d832d64 100644
--- a/src/video/cocoa/SDL_cocoamouse.m
+++ b/src/video/cocoa/SDL_cocoamouse.m
@@ -353,7 +353,7 @@ + (NSCursor *)invisibleCursor
     return 0;
 }
 
-void
+static void
 Cocoa_HandleTitleButtonEvent(_THIS, NSEvent *event)
 {
     SDL_Window *window;