[gnome-build-meta] junction.refs: Update to latest master

[Javier Jardón Cabezas <jjardon src gnome org>]

commit 71baa0fddafc1e9a47dd76527ba12f16ddbe9b08
Author: Javier Jardón <jjardon gnome org>
Date:   Thu May 24 23:05:18 2018 +0100

    junction.refs: Update to latest master
    
    This include several fixes like:
    - Inclusion of linux-pam
    - Decrease the size of base
    - Upgrade to latest meson

 junction.refs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/junction.refs b/junction.refs
index cbd69e4..3e0914e 100644
--- a/junction.refs
+++ b/junction.refs
@@ -1,4 +1,4 @@
 projects:
   gnome:
     freedesktop-sdk.bst:
-    - ref: 7fbd98e2fd0396cf774f9e44c391ffa73a3c73e6
+    - ref: 947a349ea93863adf20f6ee561b26a3409462433