sdl12-compat: update to dr_mp3.h from mainstream.

From 6f59aa8ee0a96b533354372ffc19fd1b053edf2a Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Sat, 11 Dec 2021 10:32:02 +0300
Subject: [PATCH] update to dr_mp3.h from mainstream.

---
 src/dr_mp3.h | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/dr_mp3.h b/src/dr_mp3.h
index 56344ad..dad327c 100644
--- a/src/dr_mp3.h
+++ b/src/dr_mp3.h
@@ -1,6 +1,6 @@
 /*
 MP3 audio decoder. Choice of public domain or MIT-0. See license statements at the end of this file.
-dr_mp3 - v0.6.31 - 2021-08-22
+dr_mp3 - v0.6.32 - 2021-12-11
 
 David Reid - mackron@gmail.com
 
@@ -101,7 +101,7 @@ extern "C" {
 
 #define DRMP3_VERSION_MAJOR     0
 #define DRMP3_VERSION_MINOR     6
-#define DRMP3_VERSION_REVISION  31
+#define DRMP3_VERSION_REVISION  32
 #define DRMP3_VERSION_STRING    DRMP3_XSTRINGIFY(DRMP3_VERSION_MAJOR) "." DRMP3_XSTRINGIFY(DRMP3_VERSION_MINOR) "." DRMP3_XSTRINGIFY(DRMP3_VERSION_REVISION)
 
 #include <stddef.h> /* For size_t. */
@@ -113,7 +113,7 @@ typedef   signed short          drmp3_int16;
 typedef unsigned short          drmp3_uint16;
 typedef   signed int            drmp3_int32;
 typedef unsigned int            drmp3_uint32;
-#if defined(_MSC_VER)
+#if defined(_MSC_VER) && !defined(__clang__)
     typedef   signed __int64    drmp3_int64;
     typedef unsigned __int64    drmp3_uint64;
 #else
@@ -4502,6 +4502,9 @@ counts rather than sample counts.
 /*
 REVISION HISTORY
 ================
+v0.6.32 - 2021-12-11
+  - Fix a warning with Clang.
+
 v0.6.31 - 2021-08-22
   - Fix a bug when loading from memory.