[gnome-sdk-images] pygobject has switched to meson

[Michael Catanzaro <mcatanzaro src gnome org>]

commit acb240a509dad72f3d46f2bd5f12c1cfe923f7c1
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Fri Apr 27 09:06:16 2018 -0500

    pygobject has switched to meson

 org.gnome.Sdk.json.in | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)
---
diff --git a/org.gnome.Sdk.json.in b/org.gnome.Sdk.json.in
index 4d67efa..32f6bb8 100644
--- a/org.gnome.Sdk.json.in
+++ b/org.gnome.Sdk.json.in
@@ -894,12 +894,7 @@
         },
         {
             "name": "pygobject",
-            "config-opts": ["--enable-compile-warnings=minimum"],
-            "build-options" : {
-                "env": {
-                    "PYTHON": "/usr/bin/python3"
-                }
-            },
+            "buildsystem": "meson",
             "sources": [
                 {
                     "type": "git",