SDL: Only use memset_pattern4() if we have string.h on Apple platforms

SDL Commits
1 
From ce9f3173cd7f2777cf08738bca60d5a5bcb3e21c Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Sat, 26 Nov 2022 05:25:57 -0800
Subject: [PATCH] Only use memset_pattern4() if we have string.h on Apple
 platforms

---
 src/stdlib/SDL_stdlib.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/stdlib/SDL_stdlib.c b/src/stdlib/SDL_stdlib.c
index a93ec45acd9d..d8db1d940d93 100644
--- a/src/stdlib/SDL_stdlib.c
+++ b/src/stdlib/SDL_stdlib.c
@@ -641,7 +641,7 @@ SDL_memset(SDL_OUT_BYTECAP(len) void *dst, int c, size_t len)
 void *
 SDL_memset4(void *dst, Uint32 val, size_t dwords)
 {
-#ifdef __APPLE__
+#if defined(__APPLE__) && defined(HAVE_STRING_H)
     memset_pattern4(dst, &val, dwords * 4);
 #elif defined(__GNUC__) && defined(__i386__)
     int u0, u1, u2;