[retro-gtk] flatpak: Display RetroEnvironment debug messages

[Adrien Plazas <aplazas src gnome org>]

commit c89486c35b96a1093de5c9e791d9c173e963f050
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Thu Dec 17 19:44:31 2020 +0100

    flatpak: Display RetroEnvironment debug messages
    
    This will help debugging sessions.

 flatpak/org.gnome.Retro.DemoSamplesTest.json | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/flatpak/org.gnome.Retro.DemoSamplesTest.json b/flatpak/org.gnome.Retro.DemoSamplesTest.json
index 50851e7..44b8ca3 100644
--- a/flatpak/org.gnome.Retro.DemoSamplesTest.json
+++ b/flatpak/org.gnome.Retro.DemoSamplesTest.json
@@ -37,6 +37,12 @@
         "/share/doc",
         "/share/gir-1.0"
     ],
+    "build-options" : {
+        "env" : {
+            "G_MESSAGES_DEBUG" : "RetroEnvironment",
+            "RETRO_DEBUG" : "1"
+        }
+    },
     "modules" : [
         "libretro-cores/libretro-samples.json",
         /*