[dia] win32: fix build (again)

[Zander <zbrown src gnome org>]

commit 48c22822c2eba89789c83341e78013efafd9492e
Author: Zander Brown <zbrown gnome org>
Date:   Mon Dec 2 00:06:21 2019 +0000

    win32: fix build (again)

 lib/libdia.def | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/lib/libdia.def b/lib/libdia.def
index 1714e3c4..cd9b6c73 100644
--- a/lib/libdia.def
+++ b/lib/libdia.def
@@ -674,6 +674,7 @@ EXPORTS
  persistence_register_string_entry
  persistence_change_string_entry
  persistence_register_list
+ persistent_list_clear
  persistent_list_get
  persistent_list_get_glist
  persistent_list_add