SDL: wikiheaders: README.md should be READMEs.md

SDL Commits
1 
From ad46394e82334016abd956e2ee7a7b50186ed356 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Mon, 5 May 2025 23:49:06 -0400
Subject: [PATCH] wikiheaders: README.md should be READMEs.md

So it doesn't conflict with the old README directory.
---
 build-scripts/wikiheaders.pl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/build-scripts/wikiheaders.pl b/build-scripts/wikiheaders.pl
index c9ccd0ba2589a..fa9407ebca8a9 100755
--- a/build-scripts/wikiheaders.pl
+++ b/build-scripts/wikiheaders.pl
@@ -2713,7 +2713,7 @@ sub generate_quickref {
             }
             closedir(DH);
 
-            open(FH, '>', "$wikipath/README.md") or die("Can't open '$wikipath/README.md': $!\n");
+            open(FH, '>', "$wikipath/READMEs.md") or die("Can't open '$wikipath/READMEs.md': $!\n");
             print FH "# All READMEs available here\n\n";
             foreach (sort @pages) {
                 my $wikiname = $_;