gh-127146: Skip test_netrc.test_security on Emscripten

Before #135816 it was skipped because pwd is missing on Emscripten.
Now it isn't skipped because the test no longer requires pwd but it
still doesn't work on Emscripten.

Author: hoodmane

Lib/test/test_netrc.py

@@ -273,6 +273,7 @@ def test_security_on_WASI(self):
 
     @unittest.skipUnless(os.name == 'posix', 'POSIX only test')
     @unittest.skipUnless(hasattr(os, 'getuid'), "os.getuid is required")
+    @unittest.skipIf(support.is_emscripten, "Doesn't work")
     @os_helper.skip_unless_working_chmod
     def test_security(self):
         # This test is incomplete since we are normally not run as root and