SDL_image: IMG_stb.c: fix redefinition warnings.

From f997ce78e7e2aa8291ad1856bb930a7e854b6e90 Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Tue, 10 May 2022 21:33:10 +0300
Subject: [PATCH] IMG_stb.c: fix redefinition warnings.

---
 IMG_stb.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/IMG_stb.c b/IMG_stb.c
index e5eaee3..ff63ba9 100644
--- a/IMG_stb.c
+++ b/IMG_stb.c
@@ -30,11 +30,16 @@
 #define malloc SDL_malloc
 #define realloc SDL_realloc
 #define free SDL_free
+#undef memcpy
 #define memcpy SDL_memcpy
+#undef memset
 #define memset SDL_memset
+#undef strcmp
 #define strcmp SDL_strcmp
+#undef strncmp
 #define strncmp SDL_strncmp
 #define strtol SDL_strtol
+
 #ifndef __WATCOMC__ /* watcom has issues */
 #define pow SDL_pow
 #define ldexp SDL_scalbn