SDL: silence unused function warning for SDL_endswith() on non-linux.

SDL Commits
1 
From 787cd580eeefcde30026e29e842eb3e6b236087c Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Thu, 8 Sep 2022 23:00:04 +0300
Subject: [PATCH] silence unused function warning for SDL_endswith() on
 non-linux.

---
 src/joystick/SDL_gamecontroller.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/joystick/SDL_gamecontroller.c b/src/joystick/SDL_gamecontroller.c
index 1fd5f5f0237..da3e64b9980 100644
--- a/src/joystick/SDL_gamecontroller.c
+++ b/src/joystick/SDL_gamecontroller.c
@@ -1954,6 +1954,7 @@ SDL_IsGameController(int device_index)
     return SDL_FALSE;
 }
 
+#if defined(__LINUX__)
 static SDL_bool SDL_endswith(const char *string, const char *suffix)
 {
     size_t string_length = string ? SDL_strlen(string) : 0;
@@ -1966,6 +1967,7 @@ static SDL_bool SDL_endswith(const char *string, const char *suffix)
     }
     return SDL_FALSE;
 }
+#endif
 
 /*
  * Return 1 if the game controller should be ignored by SDL