[VS Addin] Disable PNaCl adding tests until newer SDK is available

visual_studio/NativeClientVSAddIn/NaCl.Build.CPPTasks/NaClLink.cs

 
 using System;
 using System.IO;
 using System.Resources;
 using System.Reflection;
 using System.Text;
 using Microsoft.Build.Framework;
 using Microsoft.Build.CPPTasks;
 using Microsoft.Build.Utilities;
 
@@ skipping 151 matching lines @@
                 return false;
             }
 
             return true;
         }
 
         public override bool Execute()
         {
             if (Platform.Equals("pnacl", StringComparison.OrdinalIgnoreCase))
             {
-                if (!GCCUtilities.FindPython())
+                if (!SDKUtilities.FindPython())
                 {
                     Log.LogError("PNaCl linking requires python in your executable path.");
                     return false;
                 }
             }
 
             bool returnResult = false;
 
             try
             {
@@ skipping 78 matching lines @@
         {
             get
             {
                 return "GCC";
             }
             set
             {}
         }
     }
 }