[gnome-builder] rustup: fix various PyGObject deprecations

[Christian Hergert <chergert src gnome org>]

commit bbd776085f2afb542b5f7e73e15131cd6e3b02c2
Author: Christian Hergert <chergert redhat com>
Date:   Wed Mar 29 13:38:25 2017 -0600

    rustup: fix various PyGObject deprecations

 plugins/rustup/rustup_plugin/__init__.py |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/plugins/rustup/rustup_plugin/__init__.py b/plugins/rustup/rustup_plugin/__init__.py
index c2580c6..63dae41 100644
--- a/plugins/rustup/rustup_plugin/__init__.py
+++ b/plugins/rustup/rustup_plugin/__init__.py
@@ -94,7 +94,7 @@ class RustupApplicationAddin(GObject.Object, Ide.ApplicationAddin):
 
     __gsignals__ = {
         # emitted when a rustup installation is detected
-        'rustup_changed': (GObject.SIGNAL_RUN_FIRST, None, ())
+        'rustup_changed': (GObject.SignalFlags.RUN_FIRST, None, ())
     }
 
     @GObject.Property(type=bool, default=False)
@@ -527,7 +527,7 @@ class RustupPreferencesAddin(GObject.Object, Ide.PreferencesAddin):
         self.toolchain_listbox.set_selection_mode(Gtk.SelectionMode.SINGLE)
 
         def _create_list_item(item, data):
-            return Gtk.Label(item.title, halign='start', valign='center', expand=True, visible=True)
+            return Gtk.Label(label=item.title, halign='start', valign='center', expand=True, visible=True)
 
         self.store = Gio.ListStore.new(ModelItem)
         self.toolchain_listbox.bind_model(self.store, _create_list_item, None)