[polari] flatpak: Disable vala support in GSpell

[Florian Müllner <fmuellner src gnome org>]

commit d956ee870f5cf302164b87e14ab1a6be50df20d3
Author: Florian Müllner <fmuellner gnome org>
Date:   Sat Feb 18 21:44:30 2017 +0100

    flatpak: Disable vala support in GSpell
    
    We are not using Vala, so don't spend time on generating VAPIs.

 org.gnome.Polari.json |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/org.gnome.Polari.json b/org.gnome.Polari.json
index 14ceb9b..ca42af2 100644
--- a/org.gnome.Polari.json
+++ b/org.gnome.Polari.json
@@ -73,6 +73,7 @@
         },
         {
             "name": "gspell",
+            "config-opts": ["--disable-vala"],
             "sources": [
                 {
                     "type": "git",