Don't normalize path in PATH.basename()

ChangeLog.md

@@ -20,6 +20,9 @@ See docs/process.md for more on how version tagging works.
 
 3.1.75 (in development)
 -----------------------
+- `FS.basename()` no longer calls `PATH.normalize()`, so that
+  `FS.basename("a/.")` returns `"."` instead of `"a"` and `FS.basename("a/b/..")`
+  returns `".."` instead of `"a"`. (#23180)
 
 3.1.74 - 12/14/24
 -----------------

src/library_path.js

@@ -66,8 +66,7 @@ addToLibrary({
     basename: (path) => {
       // EMSCRIPTEN return '/'' for '/', not an empty string
       if (path === '/') return '/';
-      path = PATH.normalize(path);
-      path = path.replace(/\/$/, "");
+      path = path.replace(/\/+$/g, "");
       var lastSlash = path.lastIndexOf('/');
       if (lastSlash === -1) return path;
       return path.substr(lastSlash+1);