Sdl12-compat: include stdlib.h for abort()

SDL Commits
1 
From 773c59b4a3245a7469c89cb98d24847324cf3e7b Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Fri, 19 Feb 2021 07:28:10 +0300
Subject: [PATCH] include stdlib.h for abort()

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

diff --git a/src/SDL12_compat.c b/src/SDL12_compat.c
index 391857c..40a2023 100644
--- a/src/SDL12_compat.c
+++ b/src/SDL12_compat.c
@@ -39,6 +39,7 @@
 
 #include <stdarg.h>
 #include <stdio.h> /* fprintf(), etc. */
+#include <stdlib.h>    /* for abort() */
 
 /* mingw headers may define these ... */
 #undef strtod