SDL: SDL_mfijoystick.m: fix build with Xcode < 9 (9925e)

SDL Commits
1 
From 9925ee52d77893d614ebe1a3b19a4f168d6a15ba Mon Sep 17 00:00:00 2001
From: Joshua Root <[EMAIL REDACTED]>
Date: Thu, 24 Nov 2022 07:37:36 +1100
Subject: [PATCH] SDL_mfijoystick.m: fix build with Xcode < 9

Fixes #6601.

(cherry picked from commit 53ca1f77029289a58f1a9963a00b637b903f494d)
---
 src/joystick/iphoneos/SDL_mfijoystick.m | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/joystick/iphoneos/SDL_mfijoystick.m b/src/joystick/iphoneos/SDL_mfijoystick.m
index 8f207afb2efa..86e481067896 100644
--- a/src/joystick/iphoneos/SDL_mfijoystick.m
+++ b/src/joystick/iphoneos/SDL_mfijoystick.m
@@ -639,11 +639,16 @@ @interface GCMicroGamepad (SDL)
 IOS_JoystickInit(void)
 {
 #if defined(__MACOSX__)
+#if _SDL_HAS_BUILTIN(__builtin_available)
     if (@available(macOS 10.16, *)) {
         /* Continue with initialization on macOS 11+ */
     } else {
         return 0;
     }
+#else
+    /* No @available, must be an older macOS version */
+    return 0;
+#endif
 #endif
 
     @autoreleasepool {