[gnome-photos] flatpak: Add missing "buildsystem": "meson" for tracker

[Debarshi Ray <debarshir src gnome org>]

commit af9e7a8cb56a74505aca79f487fe2ae483f29e4b
Author: Debarshi Ray <debarshir gnome org>
Date:   Thu Sep 13 18:10:38 2018 +0200

    flatpak: Add missing "buildsystem": "meson" for tracker
    
    ... otherwise it will still attempt to build with Autotools.
    
    This should have been included in commit  0801c9e9c84f82eb, which
    switched tracker to Meson.

 flatpak/org.gnome.Photos.json | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/flatpak/org.gnome.Photos.json b/flatpak/org.gnome.Photos.json
index acb8be4b..d268f40b 100644
--- a/flatpak/org.gnome.Photos.json
+++ b/flatpak/org.gnome.Photos.json
@@ -255,6 +255,7 @@
         },
         {
             "name": "tracker",
+            "buildsystem": "meson",
             "cleanup": [ "/bin", "/etc", "/lib/girepository-1.0", "/libexec", "/share/dbus-1", 
"/share/gir-1.0" ],
             "config-opts": [ "-Dbash_completion=no", "-Ddocs=false", "-Dsystemd_user_services=no" ],
             "sources": [