Skip test relying on implementation sizes

Author: msimacek

graalpython/com.oracle.graal.python.test/src/tests/unittest_tags/test_types.txt

@@ -57,6 +57,7 @@
 *graalpython.lib-python.3.test.test_types.TypesTests.test_format_spec_errors
 *graalpython.lib-python.3.test.test_types.TypesTests.test_int__format__
 *graalpython.lib-python.3.test.test_types.TypesTests.test_int__format__locale
+*graalpython.lib-python.3.test.test_types.TypesTests.test_internal_sizes
 *graalpython.lib-python.3.test.test_types.TypesTests.test_normal_integers
 *graalpython.lib-python.3.test.test_types.TypesTests.test_numeric_types
 *graalpython.lib-python.3.test.test_types.TypesTests.test_strings

graalpython/lib-python/3/test/test_types.py

@@ -1,6 +1,7 @@
 # Python test set -- part 6, built-in types
 
 from test.support import run_with_locale
+from test import support
 import collections.abc
 import inspect
 import pickle
@@ -572,6 +573,7 @@ def test_format_spec_errors(self):
         for code in 'xXobns':
             self.assertRaises(ValueError, format, 0, ',' + code)
 
+    @support.impl_detail(graalvm=False)
     def test_internal_sizes(self):
         self.assertGreater(object.__basicsize__, 0)
         self.assertGreater(tuple.__itemsize__, 0)