SDL: These headers are system headers, not local headers

SDL Commits
1 
From 829f6b3d7d3bfd18b6f3307fabd51014dbec6662 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Sat, 30 Apr 2022 11:32:04 -0700
Subject: [PATCH] These headers are system headers, not local headers

---
 include/SDL_platform.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/SDL_platform.h b/include/SDL_platform.h
index 79b8b6f45d5..efa93e3fc13 100644
--- a/include/SDL_platform.h
+++ b/include/SDL_platform.h
@@ -68,8 +68,8 @@
 
 #if defined(__APPLE__)
 /* lets us know what version of Mac OS X we're compiling on */
-#include "AvailabilityMacros.h"
-#include "TargetConditionals.h"
+#include <AvailabilityMacros.h>
+#include <TargetConditionals.h>
 
 /* Fix building with older SDKs that don't define these
    See this for more information: