[NaCl SDK Addin] Fix detection of PNaCl toolchain.

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

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 using System;
 using System.Collections.Generic;
 using System.Text;
 using System.Collections;
 using System.IO;
 using System.Reflection;
 using System.Resources;
@@ skipping 256 matching lines @@
                 {
                     Log.LogError("PNaCl compilation requires python in your executable path.");
                     return -1;
                 }
 
                 // The SDK root is five levels up from the compiler binary.
                 string sdkroot = Path.GetDirectoryName(Path.GetDirectoryName(pathToTool));
                 sdkroot = Path.GetDirectoryName(Path.GetDirectoryName(sdkroot));
                 sdkroot = Path.GetDirectoryName(sdkroot);
 
-                int revision;
-                int version = SDKUtilities.GetSDKVersion(sdkroot, out revision);
-                if (revision < SDKUtilities.MinPNaCLSDKVersion)
+                if (!SDKUtilities.SupportsPNaCl(sdkroot))
                 {
+                    int revision;
+                    int version = SDKUtilities.GetSDKVersion(sdkroot, out revision);
                     Log.LogError("The configured version of the NaCl SDK ({0} r{1}) is too old " +
                                  "for building PNaCl projects.\n" +
                                  "Please install at least 24 r{2} using the naclsdk command " +
-                                 "line tool.", version, revision, SDKUtilities.MinPNaCLSDKVersion);
+                                 "line tool.", version, revision, SDKUtilities.MinPNaCLSDKVersion,
+                                 SDKUtilities.MinPNaCLSDKRevision);
                     return -1;
                 }
             }
 
             // If multiprocess compilation is enabled (not the VS default)
             // and the number of processors to use is not 1, then use the
             // compiler_wrapper python script to run multiple instances of
             // gcc
             if (MultiProcessorCompilation && ProcessorNumber != 1)
             {
@@ skipping 243 matching lines @@
         protected override string ToolName
         {
             get
             {
                 return NaCLCompilerPath;
             }
         }
 
     }
 }