[test] update tags (compiler-research#116)

fixed by compiler-research/CppInterOp#385

Author: Vipul-Cariappa

test/test_cpp11features.py

@@ -393,7 +393,6 @@ def test12_stdfunction(self):
         f = FunctionNS.FNCreateTestStructFunc()
         assert f(t) == 27
 
-    @mark.xfail
     def test13_stdhash(self):
         """Use of std::hash"""
 

test/test_crossinheritance.py

@@ -477,7 +477,6 @@ class MyPyDerived3(VD.MyClass3):
         class MyPyDerived4(VD.MyClass4[int]):
             pass
 
-    @mark.xfail
     def test14_protected_access(self):
         """Derived classes should have access to protected members"""