Fixed compilation warnings on Mono 3.4.0

diff --git a/Source/Compatibility/Tao/OpenGl/Glu.cs b/Source/Compatibility/Tao/OpenGl/Glu.cs
index 5ea0829..0ec0573 100644 (file)
--- a/Source/Compatibility/Tao/OpenGl/Glu.cs
+++ b/Source/Compatibility/Tao/OpenGl/Glu.cs
@@ -29,6 +29,8 @@ using System;
 using System.Runtime.InteropServices;
 using System.Security;
 
+#pragma warning disable 169 // private field is never used
+
 namespace Tao.OpenGl
 {
     #region Class Documentation