SDL_mixer: README.txt also uses DOS linefeeds

From 10f23b06a3398d004ef3faf792015447a1a8513e Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Mon, 3 Jul 2023 07:25:29 -0700
Subject: [PATCH] README.txt also uses DOS linefeeds

---
 .editorconfig | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/.editorconfig b/.editorconfig
index dee59802..a10d52d7 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -4,6 +4,9 @@
 
 root = true
 
+[README.txt]
+end_of_line = crlf
+
 [*.{c,cc,cg,cpp,gradle,h,java,m,metal,pl,py,S,sh,txt}]
 indent_size = 4
 indent_style = space