[gnome-builder] build: add xdg-run/gvfsd

[Christian Hergert <chergert src gnome org>]

commit b0059a28317b1405d59654ae2f0229f442703042
Author: Christian Hergert <chergert redhat com>
Date:   Fri Apr 30 21:57:26 2021 -0700

    build: add xdg-run/gvfsd

 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 01d44683f..24f59c0f3 100644
--- a/build-aux/flatpak/org.gnome.Builder.json
+++ b/build-aux/flatpak/org.gnome.Builder.json
@@ -42,6 +42,7 @@
         "--talk-name=org.gnome.SettingsDaemon.Color",
         "--talk-name=org.freedesktop.PackageKit",
         "--talk-name=org.freedesktop.secrets",
+        "--filesystem=xdg-run/gvfsd",
         "--filesystem=xdg-run/keyring",
         "--filesystem=~/.local/share/flatpak",
         "--filesystem=xdg-data/meson",