SDL_image: xxx: fix -Wundef warning '"_MSC_VER" is not defined, evaluates to 0'

SDL Commits
1 
From b511aa6c119d9b697d004210903bd05ace5b3cff Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <[EMAIL REDACTED]>
Date: Thu, 25 Jan 2024 20:16:40 +0100
Subject: [PATCH] xxx: fix -Wundef warning '"_MSC_VER" is not defined,
 evaluates to 0'

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

diff --git a/src/IMG_xxx.c b/src/IMG_xxx.c
index 783af9fd..c0fc741f 100644
--- a/src/IMG_xxx.c
+++ b/src/IMG_xxx.c
@@ -77,7 +77,7 @@ SDL_Surface *IMG_LoadXXX_RW(SDL_RWops *src)
 
 #else
 
-#if _MSC_VER >= 1300
+#if defined(_MSC_VER) && _MSC_VER >= 1300
 #pragma warning(disable : 4100) /* warning C4100: 'op' : unreferenced formal parameter */
 #endif