Make plugins not activatable under windows(dbus support needed)

mpris2_support/manifest.ini

@@ -1,7 +1,7 @@
 [info]
 name: MPRIS2 support
 short_name: mpris2_support
-version: 0.3.1
+version: 0.3.2
 description: MPRIS2 support. Allows to update status message according to the music you're listening via the MPRIS2 D-Bus API.
 authors = Denis Fomin <fominde@gmail.com>
 homepage = http://trac-plugins.gajim.org/wiki/MprisSupportPlugin

mpris2_support/mpris2_support.py

@@ -1,6 +1,8 @@
 # -*- coding: utf-8 -*-
 
 
+import os
+
 from common import gajim
 from plugins import GajimPlugin
 from plugins.helpers import log_calls
@@ -24,6 +26,9 @@ class Mpris2Plugin(GajimPlugin):
         self.config_dialog = None
         self.artist = self.title = self.source = ''
         self.listener = MusicTrackListener().get()
+        if os.name == 'nt':
+            self.available_text = _('Plugin can\'t be run under Windows.')
+            self.activatable = False
 
     @log_calls('NowListenPlugin')
     def activate(self):