tests/extmod/ssl_cadata.py: Skip test on axtls.

The axtls bindings don't support this.

Signed-off-by: Damien George <damien@micropython.org>

tests/extmod/ssl_cadata.py

@@ -10,5 +10,9 @@ except ImportError:
 # Invalid cadata.
 try:
     ssl.wrap_socket(io.BytesIO(), cadata=b"!")
+except TypeError:
+    # "cadata" keyword argument is not supported by axtls.
+    print("SKIP")
+    raise SystemExit
 except ValueError as er:
     print(repr(er))