[test] update tags

fixed by compiler-research/cppyy-backend#115 & compiler-research/CppInterOp#351

Author: Vipul-Cariappa

test/test_regression.py

@@ -895,7 +895,6 @@ def test30_uint64_t(self):
         assert ns.TTest(True).fT == True
         assert type(ns.TTest(True).fT) == bool
 
-    @mark.xfail
     def test31_enum_in_dir(self):
         """Failed to pick up enum data"""
 

test/test_stltypes.py

@@ -1830,7 +1830,7 @@ def test01_tuple_creation_and_access(self):
 
         # TODO: should be easy enough to add iterators over std::tuple?
 
-    @mark.xfail
+    @mark.xfail(condition=IS_MAC, reason="fails on OSX")
     def test02_tuple_size(self):
         """Usage of tuple_size helper class"""