[frogr] flatpak: Specify the meson build system in the unstable JSON manifest

[Mario Sanchez Prada <msanchez src gnome org>]

commit 3169ac403eefdd1d77a06d9abb790cd6781e96fa
Author: Mario Sanchez Prada <msanchez gnome org>
Date:   Wed May 24 08:47:50 2017 +0100

    flatpak: Specify the meson build system in the unstable JSON manifest

 flatpak/org.gnome.frogr-unstable.json |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/flatpak/org.gnome.frogr-unstable.json b/flatpak/org.gnome.frogr-unstable.json
index ac4e52f..71b3f83 100644
--- a/flatpak/org.gnome.frogr-unstable.json
+++ b/flatpak/org.gnome.frogr-unstable.json
@@ -34,6 +34,12 @@
     "modules": [
         {
             "name": "frogr",
+            "buildsystem": "meson",
+            "builddir": true,
+            "config-opts": [
+                /* Debug symbols will be stripped out into org.gnome.frogr.Debug */
+                "--buildtype=debugoptimized"
+            ],
             "sources": [
                 {
                     "type": "git",