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/operator.c b/Modules/operator.c
index fbe8c14..c1bf468 100644
--- a/Modules/operator.c
+++ b/Modules/operator.c
@@ -219,7 +219,7 @@
 
 /* Initialization function for the module (*must* be called initoperator) */
 
-DL_EXPORT(void)
+PyMODINIT_FUNC
 initoperator(void)
 {
         /* Create the module and add the functions */