SDL: Don't disable clang avx instrinsics on win32 if __AVX__ is defined.

SDL Commits
1 
From 44a76710d1a4f2bbcee47b14d4bdd8d75263d094 Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Wed, 11 Aug 2021 12:55:50 +0300
Subject: [PATCH] Don't disable clang avx instrinsics on win32 if __AVX__ is
 defined.

C.f.: https://github.com/libsdl-org/SDL/issues/4533
---
 src/audio/SDL_audiocvt.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/audio/SDL_audiocvt.c b/src/audio/SDL_audiocvt.c
index f422b2b96..06ccce74e 100644
--- a/src/audio/SDL_audiocvt.c
+++ b/src/audio/SDL_audiocvt.c
@@ -47,7 +47,10 @@
 #define HAVE_AVX_INTRINSICS 1
 #endif
 #if defined __clang__
-# if (__clang_major__ < 5) || defined(_MSC_VER) || defined(__SCE__)
+# if (__clang_major__ < 5)
+#   undef HAVE_AVX_INTRINSICS
+# endif
+# if (defined(_MSC_VER) || defined(__SCE__)) && !defined(__AVX__)
 #   undef HAVE_AVX_INTRINSICS
 # endif
 #elif defined __GNUC__