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

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

This should fix the current test failures on the bot.


BUG=

Committed: https://code.google.com/p/nativeclient-sdk/source/detail?r=1460

[Sam Clegg, 2012-10-31 03:16:34]

This change will make the Addin tree green again.

Currently there is no public SDK with my PNaCl front end fixes in it so the
PNaCl tests will simply skip on the bots until there is.

[binji, 2012-10-31 06:36:22]

lgtm

https://chromiumcodereview.appspot.com/11340059/diff/1001/visual_studio/Nativ...
File visual_studio/NativeClientVSAddIn/NaCl.Build.CPPTasks/NaClCompile.cs
(right):

https://chromiumcodereview.appspot.com/11340059/diff/1001/visual_studio/Nativ...
visual_studio/NativeClientVSAddIn/NaCl.Build.CPPTasks/NaClCompile.cs:289: // If
multiprocess complication is enabled (not the VS default)
sp: compilation

https://chromiumcodereview.appspot.com/11340059/diff/1001/visual_studio/Nativ...
visual_studio/NativeClientVSAddIn/NaCl.Build.CPPTasks/NaClCompile.cs:297:
MessageBox.Show("Multi-processor Compilation with NaCl requires that python " +
maybe this should be Log.LogError like above?

https://chromiumcodereview.appspot.com/11340059/diff/1001/visual_studio/Nativ...
File visual_studio/NativeClientVSAddIn/NaCl.Build.CPPTasks/SDKUtilities.cs
(right):

https://chromiumcodereview.appspot.com/11340059/diff/1001/visual_studio/Nativ...
visual_studio/NativeClientVSAddIn/NaCl.Build.CPPTasks/SDKUtilities.cs:46: public
static int GetSDKVersion(string root, out int revision)
seems a little strange to me to have a return value and an out value, but OK

https://chromiumcodereview.appspot.com/11340059/diff/1001/visual_studio/Nativ...
visual_studio/NativeClientVSAddIn/NaCl.Build.CPPTasks/SDKUtilities.cs:48: //
Determin version by parsing top level README file.
sp: Determine