SDL_mixer: Added patch note for CMake support

From 6ace7e9fd1f0bca00ab831713a3396f7d827566b Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Thu, 7 Jul 2022 06:29:28 -0700
Subject: [PATCH] Added patch note for CMake support

---
 CHANGES.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/CHANGES.txt b/CHANGES.txt
index c7f19d30..48e934cf 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,4 +1,5 @@
 2.6.0:
+ * Added support for building with CMake
  * Added support for playing Ogg files using stb_vorbis, which is now the default Vorbis backend.
    To use libvorbis instead, configure using --disable-music-ogg-stb --enable-music-ogg-vorbis
  * Added support for playing FLAC files using dr_flac, which is now the default FLAC music backend.