Disable test_fs_mkdir_dotdot on windows. NFC

This test was recently added in emscripten-core#23136 but the test fails on windows
due to errno mismatch.  See emscripten-core#8882.

Author: sbc100

test/test_core.py

@@ -5859,6 +5859,8 @@ def test_fs_rename_on_existing(self):
     self.do_runf('fs/test_fs_rename_on_existing.c', 'success')
 
   @also_with_nodefs_both
+  @crossplatform
+  @no_windows('https://github.com/emscripten-core/emscripten/issues/8882')
   def test_fs_mkdir_dotdot(self):
     self.do_runf('fs/test_fs_mkdir_dotdot.c', 'success')