Updates core.

Signed-off-by: Stéphane Jacob <sj@m4x.org>

diff --git a/core b/core
index e617a93..d3e8ac4 160000 (submodule)
--- a/core
+++ b/core
@@ -1 +1 @@
-Subproject commit e617a9308d1b8523fe76e8ae274b2eb5dee325a9
+Subproject commit d3e8ac41247fb278285704bd8bf819a5275e5aca