Prevent monkey patching

This doesn't affect globals (describe, it, expect, etc). Those belong to
the user and Jasmine doesn't depend on them.

spec/core/EnvSpec.js

@@ -874,4 +874,8 @@ describe('Env', function() {
       }).toThrowError('Jasmine cannot be configured via Env in parallel mode');
     });
   });
+
+  isNonMonkeyPatchableClass(privateUnderTest.Env, function() {
+    return new privateUnderTest.Env();
+  });
 });