[gnome-builder] build: use libpeas from meson

[Christian Hergert <chergert src gnome org>]

commit 2ec5edb460c27398f5efb8094239a50d14eaceb2
Author: Christian Hergert <chergert redhat com>
Date:   Mon Aug 5 19:31:22 2019 -0700

    build: use libpeas from meson

 build-aux/flatpak/org.gnome.Builder.json | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)
---
diff --git a/build-aux/flatpak/org.gnome.Builder.json b/build-aux/flatpak/org.gnome.Builder.json
index 2b6c76dca..19e6d3ad7 100644
--- a/build-aux/flatpak/org.gnome.Builder.json
+++ b/build-aux/flatpak/org.gnome.Builder.json
@@ -248,18 +248,9 @@
                 }
             ]
         },
-        {
-            "name" : "gnome-common",
-            "cleanup" : [ "*" ],
-            "sources" : [
-                {
-                    "type" : "git",
-                    "url" : "https://gitlab.gnome.org/GNOME/gnome-common.git";
-                }
-            ]
-        },
         {
             "name" : "libpeas",
+            "buildsystem" : "meson",
             "cleanup" : [
                 "/bin/*",
                 "/lib/peas-demo",