sdl12-compat: Fix a struct typedef to match the others.

SDL Commits
1 
From da3b11a81bf9cd9628f31739e359ff7849fd43d9 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Fri, 18 Jun 2021 00:36:33 -0400
Subject: [PATCH] Fix a struct typedef to match the others.

---
 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 e0b2eac..a61101a 100644
--- a/src/SDL12_compat.c
+++ b/src/SDL12_compat.c
@@ -776,7 +776,7 @@ typedef struct
     Uint32 offset;
 } SDL12_CDtrack;
 
-typedef struct SDL12_CD
+typedef struct
 {
     int id;
     SDL12_CDstatus status;