[gnome-maps] flatpak: Build libchamplain with Meson

[Marcus Lundblad <mlundblad src gnome org>]

commit 6909c41d655092f854238726bb35caa11b1d1da9
Author: Marcus Lundblad <ml update uu se>
Date:   Mon Apr 29 23:08:47 2019 +0200

    flatpak: Build libchamplain with Meson
    
    Fixes #177

 org.gnome.Maps.json | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/org.gnome.Maps.json b/org.gnome.Maps.json
index 7336cff..6507156 100644
--- a/org.gnome.Maps.json
+++ b/org.gnome.Maps.json
@@ -175,6 +175,7 @@
         },
         {
             "name" : "libchamplain",
+            "buildsystem": "meson",
             "sources" : [
                 {
                     "type" : "git",