Sdl12-compat: fix windows compiler definition check

SDL Commits
1 
From 6f423d09fa3f974fdae5ca3ec8d237efedaa8e23 Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Fri, 19 Feb 2021 05:46:21 +0300
Subject: [PATCH] fix windows compiler definition check

---
 src/SDL12_compat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/SDL12_compat.c b/src/SDL12_compat.c
index 18e6c50..0ea9cd8 100644
--- a/src/SDL12_compat.c
+++ b/src/SDL12_compat.c
@@ -762,7 +762,7 @@ static EventQueueType *EventQueueAvailable = NULL;
 
 
 /* Obviously we can't use SDL_LoadObject() to load SDL2.  :)  */
-#if defined(_WINDOWS)
+#if defined(_WIN32)
     #ifndef WIN32_LEAN_AND_MEAN
     #define WIN32_LEAN_AND_MEAN 1
     #endif