Excise DL_EXPORT/DL_IMPORT from Modules/*.  Required adding a prototype
for Py_Main().

Thanks to Kalle Svensson and Skip Montanaro for the patches.
diff --git a/Modules/_codecsmodule.c b/Modules/_codecsmodule.c
index aed3c42..d663293 100644
--- a/Modules/_codecsmodule.c
+++ b/Modules/_codecsmodule.c
@@ -703,7 +703,7 @@
     {NULL, NULL}		/* sentinel */
 };
 
-DL_EXPORT(void)
+PyMODINIT_FUNC
 init_codecs(void)
 {
     Py_InitModule("_codecs", _codecs_functions);