tests/ussl_basic: Disable setblocking() calls.

Now that setblocking() is implemented in modussl_axtls, it calls into the
underlying stream object, and io.BytesIO doesn't have setblocking().

tests/extmod/ussl_basic.py

@@ -20,12 +20,13 @@ ss = ssl.wrap_socket(socket, server_side=1)
 # print
 print(repr(ss)[:12])
 
-# setblocking
-try:
-    ss.setblocking(False)
-except NotImplementedError:
-    print('setblocking: NotImplementedError')
-ss.setblocking(True)
+# setblocking() propagates call to the underlying stream object, and
+# io.BytesIO doesn't have setblocking() (in CPython too).
+#try:
+#    ss.setblocking(False)
+#except NotImplementedError:
+#    print('setblocking: NotImplementedError')
+#ss.setblocking(True)
 
 # write
 print(ss.write(b'aaaa'))

tests/extmod/ussl_basic.py.exp

 ssl_handshake_status: -256
 wrap_socket: OSError(5,)
 <_SSLSocket 
-setblocking: NotImplementedError
 4
 b''
+read: OSError(-261,)
 read: OSError(9,)
 write: OSError(9,)