bpo-43155: Add PyCMethod_New to PC/python3dll.c (GH-24500)

diff --git a/PC/python3dll.c b/PC/python3dll.c
index 542853a..3f87b70 100644
--- a/PC/python3dll.c
+++ b/PC/python3dll.c
@@ -128,6 +128,7 @@ EXPORT_FUNC(PyCFunction_GetFunction)
 EXPORT_FUNC(PyCFunction_GetSelf)
 EXPORT_FUNC(PyCFunction_New)
 EXPORT_FUNC(PyCFunction_NewEx)
+EXPORT_FUNC(PyCMethod_New)
 EXPORT_FUNC(PyCodec_BackslashReplaceErrors)
 EXPORT_FUNC(PyCodec_Decode)
 EXPORT_FUNC(PyCodec_Decoder)