[gnome-font-viewer] flatpak: Set builddir to true

[Christopher Davis <christopherdavis src gnome org>]

commit c3a45f86cc531286c560606f92b348d152298f98
Author: Christopher Davis <christopherdavis gnome org>
Date:   Sat Feb 13 00:10:25 2021 -0800

    flatpak: Set builddir to true
    
    Enables out-of-tree builds when using the flatpak.

 flatpak/org.gnome.font-viewerDevel.json | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/flatpak/org.gnome.font-viewerDevel.json b/flatpak/org.gnome.font-viewerDevel.json
index 60b44d7..b05406e 100644
--- a/flatpak/org.gnome.font-viewerDevel.json
+++ b/flatpak/org.gnome.font-viewerDevel.json
@@ -40,6 +40,7 @@
         {
             "name": "gnome-font-viewer",
             "buildsystem": "meson",
+            "builddir" : true,
             "config-opts": ["-Dprofile=development"],
             "sources": [
                 {