Add DL_EXPORT() to all modules that could possibly be used
on BeOS or Windows.
diff --git a/Modules/readline.c b/Modules/readline.c
index 915cc4a..08569f6 100644
--- a/Modules/readline.c
+++ b/Modules/readline.c
@@ -304,7 +304,7 @@
 static char doc_module[] =
 "Importing this module enables command line editing using GNU readline.";
 
-void
+DL_EXPORT(void)
 initreadline()
 {
 	PyObject *m;