[banshee] GStreamerSharp: use Hyena for platform detection

[Andrés Aragoneses <aaragoneses src gnome org>]

commit 2fc01d78326d41c97b15b72002c1a3328c670150
Author: Andrés G. Aragoneses <knocte gmail com>
Date:   Tue May 26 13:52:01 2015 +0200

    GStreamerSharp: use Hyena for platform detection
    
    This way we avoid the horrible System.Environment.OSVersion API.

 .../Banshee.GStreamerSharp/VideoManager.cs         |   17 +++++------------
 1 files changed, 5 insertions(+), 12 deletions(-)
---
diff --git a/src/Backends/Banshee.GStreamerSharp/Banshee.GStreamerSharp/VideoManager.cs 
b/src/Backends/Banshee.GStreamerSharp/Banshee.GStreamerSharp/VideoManager.cs
index c0f2c1c..b710c44 100644
--- a/src/Backends/Banshee.GStreamerSharp/Banshee.GStreamerSharp/VideoManager.cs
+++ b/src/Backends/Banshee.GStreamerSharp/Banshee.GStreamerSharp/VideoManager.cs
@@ -4,7 +4,7 @@
 // Authors:
 //  Olivier Dufour <olivier duff gmail com>
 //  Andrés G. Aragoneses <knocte gmail com>
-//   Stephan Sundermann <stephansundermann gmail com>
+//  Stephan Sundermann <stephansundermann gmail com>
 //
 // Copyright (C) 2011 Olivier Dufour
 // Copyright (C) 2013 Andrés G. Aragoneses
@@ -294,21 +294,14 @@ namespace Banshee.GStreamerSharp
 
         public void WindowRealize (IntPtr window)
         {
-            switch (System.Environment.OSVersion.Platform) {
-                case PlatformID.Unix:
+            if (PlatformDetection.IsWindows) {
+                video_window_xid = (ulong)gdk_win32_drawable_get_handle (window);
+            } else if (PlatformDetection.IsUnix) {
                     //FIXME: we should maybe stop relying on x11 
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-gstvideooverlay.html#GstVideoOverlay
-                    video_window_xid = (ulong)gdk_x11_window_get_xid (window);
-                break;
-                case PlatformID.Win32NT:
-                case PlatformID.Win32S:
-                case PlatformID.Win32Windows:
-                case PlatformID.WinCE:
-                    video_window_xid = (ulong)gdk_win32_drawable_get_handle (window);
-                break;
+                video_window_xid = (ulong)gdk_x11_window_get_xid (window);
             }
         }
 
-
         [DllImport ("libgdk-3-0.dll")]
         private static extern IntPtr gdk_x11_window_get_xid (IntPtr drawable);