Updates core.

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

diff --git a/core b/core
index df1ec68..bce0d8c 160000 (submodule)
--- a/core
+++ b/core
@@ -1 +1 @@
-Subproject commit df1ec683f930734d7532bd3dc3b10c46da947748
+Subproject commit bce0d8c7608b7dd361810d4143792db5affaf2ca