path: fix relative on Windows

PR-URL: https://github.com/nodejs/node/pull/53991
Fixes: https://github.com/nodejs/node/issues/27534
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

benchmark/path/relative-win32.js

@@ -9,6 +9,7 @@ const bench = common.createBenchmark(main, {
     ['C:\\foo\\bar\\baz', 'C:\\foo\\bar\\baz'].join('|'),
     ['C:\\foo\\BAR\\BAZ', 'C:\\foo\\bar\\baz'].join('|'),
     ['C:\\foo\\bar\\baz\\quux', 'C:\\'].join('|'),
+    ['c:\\İ\\a\\İ', 'c:\\İ\\b\\İ\\test.txt', '..\\..\\b\\İ\\test.txt'].join('|'),
   ],
   n: [1e5],
 });