Reverting the update of core, I was fooled by git-commit -as.

Signed-off-by: Vincent Zanotti <vincent.zanotti@m4x.org>

diff --git a/core b/core
index a59a444..80c3b57 160000 (submodule)
--- a/core
+++ b/core
@@ -1 +1 @@
-Subproject commit a59a4446b3f96e25620e98d4aab14860dd2ee951
+Subproject commit 80c3b5792bea15876ef8f79b8a64421733c1c001