Update pdns-builder

diff --git a/builder b/builder
index 124bbe72e4434a60dd764ad9c1d38f380d7a37b7..18ec237fb2cd032aad7359b44c2aeb83dfecdd95 160000 (submodule)
--- a/builder
+++ b/builder
@@ -1 +1 @@
-Subproject commit 124bbe72e4434a60dd764ad9c1d38f380d7a37b7
+Subproject commit 18ec237fb2cd032aad7359b44c2aeb83dfecdd95