bpo-29548: Fix some inefficient call API usage (GH-97)

diff --git a/Objects/weakrefobject.c b/Objects/weakrefobject.c
index ab6b235..d12db91 100644
--- a/Objects/weakrefobject.c
+++ b/Objects/weakrefobject.c
@@ -461,7 +461,7 @@
 
 WRAP_BINARY(proxy_getattr, PyObject_GetAttr)
 WRAP_UNARY(proxy_str, PyObject_Str)
-WRAP_TERNARY(proxy_call, PyEval_CallObjectWithKeywords)
+WRAP_TERNARY(proxy_call, PyObject_Call)
 
 static PyObject *
 proxy_repr(PyWeakReference *proxy)