added forward declaration to prevent one compile error

echo/python/Python/ceval.c

@@ -13,6 +13,9 @@ static PyObject *do_call(PyObject *, PyObject ***, int, int);
 static PyObject *update_keyword_args(PyObject *, int, PyObject ***,PyObject *);
 static PyObject *load_args(PyObject ***, int);
 
+/* @@@ need to investigate need for this */
+PyObject *PyEval_CallObjectWithKeywords(PyObject *, PyObject *, PyObject *);
+
 /* Mechanism whereby asynchronously executing callbacks (e.g. UNIX
    signal handlers or Mac I/O completion routines) can schedule calls
    to a function to be called synchronously.