[gnome-klotski] Fix Flatpak build.

[Arnaud B. <arnaudb src gnome org>]

commit 5fe2668a0262d6a1bfa3a32a3ddfa3275d4efab7
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Sat Nov 23 10:07:25 2019 +0100

    Fix Flatpak build.

 build-aux/org.gnome.Klotski.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/build-aux/org.gnome.Klotski.json b/build-aux/org.gnome.Klotski.json
index d2f08bd..a0b2986 100644
--- a/build-aux/org.gnome.Klotski.json
+++ b/build-aux/org.gnome.Klotski.json
@@ -25,6 +25,7 @@
         },
         {
             "name": "libgnome-games-support",
+            "buildsystem": "meson",
             "sources": [{
                 "type": "git",
                 "url": "https://gitlab.gnome.org/GNOME/libgnome-games-support.git";
@@ -39,4 +40,4 @@
             }]
         }
     ]
-}
\ No newline at end of file
+}