Add DL_EXPORT() to all modules that could possibly be used
on BeOS or Windows.
diff --git a/Modules/structmodule.c b/Modules/structmodule.c
index a20d5ff..9994d20 100644
--- a/Modules/structmodule.c
+++ b/Modules/structmodule.c
@@ -1358,7 +1358,7 @@
 
 /* Module initialization */
 
-void
+DL_EXPORT(void)
 initstruct()
 {
 	PyObject *m, *d;