Pull shibboleth sp 3759

diff --git a/shibboleth/sp b/shibboleth/sp
index 3c1e801..a88b3c8 160000 (submodule)
--- a/shibboleth/sp
+++ b/shibboleth/sp
@@ -1 +1 @@
-Subproject commit 3c1e801d6539b92d6d3d7fb40d661a7ce630ec44
+Subproject commit a88b3c840ca70bbaa1dc828790e36b394e3dfba9