[ghex/bilelmoussaoui/ci] Flatpak: use meson buildsystem

[Bilal Elmoussaoui <bilelmoussaoui src gnome org>]

commit 9d037148ac3c1a004ebc15be19da827f112381a5
Author: Bilal Elmoussaoui <bil elmoussaoui gmail com>
Date:   Thu Jun 4 11:21:22 2020 +0000

    Flatpak: use meson buildsystem
    
    Fixes the failing CI

 org.gnome.GHex.json | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/org.gnome.GHex.json b/org.gnome.GHex.json
index b7ba7d2..b31dd24 100644
--- a/org.gnome.GHex.json
+++ b/org.gnome.GHex.json
@@ -18,6 +18,7 @@
     "modules": [
         {
             "name": "ghex",
+            "buildsystem": "meson",
             "sources": [{
                 "type": "git",
                 "url": "https://gitlab.gnome.org/GNOME/ghex.git";