Excise DL_EXPORT/DL_IMPORT from Modules/*. Required adding a prototype

for Py_Main().

Thanks to Kalle Svensson and Skip Montanaro for the patches.

Modules/_codecsmodule.c

@@ -703,7 +703,7 @@ static PyMethodDef _codecs_functions[] = {
     {NULL, NULL}		/* sentinel */
 };
 
-DL_EXPORT(void)
+PyMODINIT_FUNC
 init_codecs(void)
 {
     Py_InitModule("_codecs", _codecs_functions);