[gnome-apps-nightly] Builder: use /var/lib/flatpak instead of /app prefix

[Christian Hergert <chergert src gnome org>]

commit a7d3350511b5bf8540bec994dc88e7a9bbf09283
Author: Christian Hergert <chergert redhat com>
Date:   Fri Oct 28 18:39:12 2016 -0700

    Builder: use /var/lib/flatpak instead of /app prefix
    
    We need this so we can access the host Flatpak installation, rather than
    the alternate prefix for /app, which is read-only.

 org.gnome.Builder.json |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/org.gnome.Builder.json b/org.gnome.Builder.json
index 40534ba..ee97c01 100644
--- a/org.gnome.Builder.json
+++ b/org.gnome.Builder.json
@@ -94,7 +94,8 @@
             "config-opts": [ "--disable-documentation",
                              "--disable-seccomp",
                              "--disable-sandboxed-triggers",
-                             "--disable-system-helper" ],
+                             "--disable-system-helper",
+                             "--with-system-install-dir=/var/lib/flatpak" ],
             "cleanup": [ "/etc/profile.d",
                          "/bin/flatpak",
                          "/bin/flatpak-builder",