rpc: method introspection: skip failing introspection test on pypy

Signed-off-by: Florian Scherf <f.scherf@pengutronix.de>

Author: fscherf

tests/test_method_args.py

@@ -163,6 +163,15 @@ async def method(a):
 
 @pytest.mark.asyncio
 async def test_introspection_of_unsupported_function_types(rpc_context):
+    import inspect
+
+    try:
+        inspect.getfullargspec(min)
+        pytest.skip('no native C code available')  # FIXME: pypy compatibility
+
+    except Exception:
+        pass
+
     rpc_context.rpc.add_methods(
         ('', min),
     )