bpo-37483: add _PyObject_CallOneArg() function (#14558)

diff --git a/Python/import.c b/Python/import.c
index 3937fbe..76866ae 100644
--- a/Python/import.c
+++ b/Python/import.c
@@ -1180,7 +1180,7 @@
         PyObject *hook = PyList_GetItem(path_hooks, j);
         if (hook == NULL)
             return NULL;
-        importer = PyObject_CallFunctionObjArgs(hook, p, NULL);
+        importer = _PyObject_CallOneArg(hook, p);
         if (importer != NULL)
             break;