Update multibuild to latest master

jorisvandenbossche · jorisvandenbossche · commit f0c86b32ed81 · 2016-12-29T16:23:12.000+01:00
diff --git a/multibuild b/multibuild
@@ -1 +1 @@
-Subproject commit 6802dca5d640b277aa84009b857074e3d86bd994
+Subproject commit cd526bf4505fc4a10d7d045350053ff9954892fa
