SDL_mixer: Fixed typo

From f23ae75c4006fbab0e1f9c1927702a2edce11af5 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Thu, 16 Jun 2022 21:52:45 -0700
Subject: [PATCH] Fixed typo

---
 Makefile.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile.in b/Makefile.in
index 52e70d9b..73e14d8b 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -46,7 +46,7 @@ SRC_DIST =			\
 	.gitmodules		\
 	Android.mk		\
 	CMakeLists.txt		\
-	cmake
+	cmake			\
 	Makefile.in		\
 	Makefile.os2		\
 	SDL2_mixer.pc.in	\