[gnome-games/wip/exalm/ci: 1/3] flatpak: Create libretro/extra.d as a separate module

[Alexander Mikhaylenko <alexm src gnome org>]

commit a8fa47fa8d785999166bf7caf364ba8fc5e063da
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Wed Sep 18 23:39:13 2019 +0500

    flatpak: Create libretro/extra.d as a separate module
    
    Stop using post-install, CI doesn't like it.

 flatpak/org.gnome.Games.json | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)
---
diff --git a/flatpak/org.gnome.Games.json b/flatpak/org.gnome.Games.json
index 14d62561..05cf2722 100644
--- a/flatpak/org.gnome.Games.json
+++ b/flatpak/org.gnome.Games.json
@@ -83,6 +83,13 @@
         "libretro-cores/libretro-prboom.json",
         "libretro-cores/libretro-prosystem.json",
         "libretro-cores/libretro-stella2014.json",
+        {
+            "name" : "libretro-extra",
+            "buildsystem" : "simple",
+            "build-commands": [
+                "mkdir -p /app/lib/libretro/extra.d"
+            ]
+        },
         /* End libretro cores */
         "org.lua.modules.json",
         {
@@ -222,9 +229,6 @@
             "config-opts" : [
                 "-Dprofile=development"
             ],
-            "post-install" : [
-                "mkdir -p /app/lib/libretro/extra.d"
-            ],
             "sources" : [
                 {
                     "type" : "git",