Remove unnecessary test class

Author: encukou

Lib/test/test_call.py

@@ -311,12 +311,6 @@ def test_fastcall_keywords_ext(self):
         )
 
 
-@cpython_only
-class TestCallingConventionsFunction(TestCallingConventions):
-    """Test calling module-level functions using various calling conventions"""
-
-
-
 @cpython_only
 class TestCallingConventionsInstance(TestCallingConventions):
     """Test calling instance methods using various calling conventions"""