Make plugins not activatable under windows(dbus support needed)

wicd_support/manifest.ini

@@ -1,7 +1,7 @@
 [info]
 name: Wicd support
 short_name: wicd_support
-version: 0.1.1
+version: 0.1.2
 description: Support for autodetection of network status for Wicd Network Manager.
  Requires wicd and python-dbus.
 authors = Denis Fomin <fominde@gmail.com>

wicd_support/wicd_support.py

@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
 
+import os
 
 from common import gajim
 from plugins import GajimPlugin
@@ -17,6 +18,10 @@ class WicdPlugin(GajimPlugin):
 
     def test_activatable(self):
         self.available_text = ''
+        if os.name == 'nt':
+            self.available_text = _('Plugin can\'t be run under Windows.')
+            self.activatable = False
+            return
         if not dbus_support.supported:
             self.activatable = False
             self.available_text += _('python-dbus is missing! '