[libshumate] flatpak: Don't build docs

[Corentin Noël <corentinnoel src gnome org>]

commit b3b40b1a3bd33b715dc46582872f905e4de34402
Author: James Westman <james jwestman net>
Date:   Mon Nov 8 12:20:46 2021 -0600

    flatpak: Don't build docs
    
    Don't build the docs in flatpak because the Python packages needed aren't in
    the runtime.

 demos/org.gnome.Shumate.Demo.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/demos/org.gnome.Shumate.Demo.json b/demos/org.gnome.Shumate.Demo.json
index 6b4d8e5..7e013fd 100644
--- a/demos/org.gnome.Shumate.Demo.json
+++ b/demos/org.gnome.Shumate.Demo.json
@@ -54,7 +54,8 @@
             "name" : "libshumate",
             "buildsystem" : "meson",
             "config-opts" : [
-                "-Ddemos=true"
+                "-Ddemos=true",
+                "-Dgtk_doc=false"
             ],
             "builddir" : true,
             "sources" : [