sdl2-compat: replace an SDL_copyp use to avoid -Wunused-local-typedefs warning.

SDL Commits
1 
From 26bd92eda2f9420e0c33877efe331f8d7c0c157a Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Tue, 8 Aug 2023 17:11:50 +0300
Subject: [PATCH] replace an SDL_copyp use to avoid -Wunused-local-typedefs
 warning.

happens e.g. with gcc-4.8, gcc-4.9, etc.  we already know that the
pointers are of the same type in ParseAudioFormat(), therefore, no
danger there.
---
 src/sdl2_compat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/sdl2_compat.c b/src/sdl2_compat.c
index bf5cd31..bb0b33a 100644
--- a/src/sdl2_compat.c
+++ b/src/sdl2_compat.c
@@ -3693,7 +3693,7 @@ static SDL_AudioFormat ParseAudioFormat(const char *string)
 
 static int PrepareAudiospec(const SDL2_AudioSpec *orig2, SDL2_AudioSpec *prepared2)
 {
-    SDL3_copyp(prepared2, orig2);
+    SDL3_memcpy(prepared2, orig2, sizeof(*orig2));
 
     if (orig2->freq == 0) {
         static const int DEFAULT_FREQ = 22050;