remove shadowing declartion

Modules/_testcapimodule.c

@@ -627,7 +627,6 @@ test_u_code(PyObject *self)
 	PyObject *tuple, *obj;
 	Py_UNICODE *value;
 	Py_ssize_t len;
-	int x;
 
 	/* issue4122: Undefined reference to _Py_ascii_whitespace on Windows */
 	/* Just use the macro and check that it compiles */