[lldb/testsuite] Skip part of TestSettings.py on windows

The newly introduced tests for unsetting environment variables
is failing on Windows. Skip the test there to allow investigation.

It seems like setting inherit-env to false was never tested
before. Could it be that the Windows process launcher doesn't
honor this setting?

lldb/test/API/commands/settings/TestSettings.py

@@ -286,6 +286,7 @@ class SettingsCommandTestCase(TestBase):
                 "Environment variable 'MY_ENV_VAR' successfully passed."])
 
     @skipIfRemote  # it doesn't make sense to send host env to remote target
+    @skipIf(oslist=["windows"])
     def test_pass_host_env_vars(self):
         """Test that the host env vars are passed to the launched process."""
         self.build()