[gnome-builder] flatpak: add --socket=ssh-auth

[Christian Hergert <chergert src gnome org>]

commit 75a9e9d3663fedaec7f2375ec6bdb3f53fd48125
Author: Christian Hergert <chergert redhat com>
Date:   Mon Mar 18 12:57:16 2019 -0700

    flatpak: add --socket=ssh-auth

 build-aux/flatpak/org.gnome.Builder.json | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/build-aux/flatpak/org.gnome.Builder.json b/build-aux/flatpak/org.gnome.Builder.json
index 7e1fd7f8e..b713c3e52 100644
--- a/build-aux/flatpak/org.gnome.Builder.json
+++ b/build-aux/flatpak/org.gnome.Builder.json
@@ -16,6 +16,7 @@
         "--share=ipc",
         "--socket=x11",
         "--socket=wayland",
+        "--socket=ssh-auth",
         "--filesystem=home",
         "--filesystem=host",
         "--share=network",