SDL_mixer: update libxmp. (5b23f)

From 5b23f1aea02fbd86685711cff25619bc7765d61f Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Fri, 16 Jun 2023 00:05:50 +0300
Subject: [PATCH] update libxmp.

---
 .gitmodules     | 2 +-
 external/libxmp | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/.gitmodules b/.gitmodules
index ee7bd10e..66d8781e 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -29,7 +29,7 @@
 [submodule "libxmp"]
 	path = external/libxmp
 	url = https://github.com/libsdl-org/libxmp.git
-	branch = pre4.5.1-SDL-3
+	branch = 4.6.0-SDL
 [submodule "external/wavpack"]
 	path = external/wavpack
 	url = https://github.com/libsdl-org/wavpack.git
diff --git a/external/libxmp b/external/libxmp
index 0e39a8a7..85ee7857 160000
--- a/external/libxmp
+++ b/external/libxmp
@@ -1 +1 @@
-Subproject commit 0e39a8a7b5044ddd5fc3569f369dc2c798825a4d
+Subproject commit 85ee78575223009ecc51cd6961687b9e98d2a1e0