bump reference source

diff --git a/external/referencesource b/external/referencesource
index 23a693e927c1191a5c9857d46bcca7a456f59fa5..6f45ec787b278a84eee84832a44e255871ba2a20 160000 (submodule)
--- a/external/referencesource
+++ b/external/referencesource
@@ -1 +1 @@
-Subproject commit 23a693e927c1191a5c9857d46bcca7a456f59fa5
+Subproject commit 6f45ec787b278a84eee84832a44e255871ba2a20