bpo-38304: PyConfig_InitPythonConfig() cannot fail anymore (GH-16509)

PyConfig_InitPythonConfig() and PyConfig_InitIsolatedConfig() no
longer return PyStatus: they cannot fail anymore.
diff --git a/Python/frozenmain.c b/Python/frozenmain.c
index c56938a..7f9cc19 100644
--- a/Python/frozenmain.c
+++ b/Python/frozenmain.c
@@ -40,11 +40,7 @@
     }
 
     PyConfig config;
-    status = PyConfig_InitPythonConfig(&config);
-    if (PyStatus_Exception(status)) {
-        PyConfig_Clear(&config);
-        Py_ExitStatusException(status);
-    }
+    PyConfig_InitPythonConfig(&config);
     config.pathconfig_warnings = 0;   /* Suppress errors from getpath.c */
 
     if ((p = Py_GETENV("PYTHONINSPECT")) && *p != '\0')