Disabling build of System.Interactive.Async.Providers for non-supported platforms.

Ix.NET/Source/Interactive Extensions.sln

@@ -195,33 +195,25 @@ Global
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 	EndGlobalSection

Ix.NET/Source/Tests/AsyncQueryableTests.Generated.cs

@@ -1,4 +1,6 @@
 // Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+#if !SILVERLIGHTM7 && !PORTABLE
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -3371,4 +3373,5 @@ namespace Tests
 		}
 
 	}
-}
+}
+#endif