[msbuild] LLVM is possible for armv7k as well. (#87)

msbuild/Xamarin.iOS.Tasks.Core/Tasks/MTouchTaskBase.cs

@@ -474,7 +474,7 @@ namespace Xamarin.iOS.Tasks
 				}
 
 				if (architectures.HasFlag (TargetArchitecture.ARMv7k))
-					abi += (abi.Length > 0 ? "," : "") + "armv7k";
+					abi += (abi.Length > 0 ? "," : "") + "armv7k" + llvm;
 
 				if (string.IsNullOrEmpty (abi))
 					abi = "armv7" + llvm + thumb;