Add DL_EXPORT() to all modules that could possibly be used
on BeOS or Windows.
diff --git a/Modules/_tkinter.c b/Modules/_tkinter.c
index 86a4e58..9d68c69 100644
--- a/Modules/_tkinter.c
+++ b/Modules/_tkinter.c
@@ -2006,7 +2006,7 @@
 }
 
 
-void
+DL_EXPORT(void)
 init_tkinter()
 {
 	PyObject *m, *d;