[tests] Remove mcs assert which isn't needed anymore.

tests/mmptest/src/BindingProjectTests.cs

@@ -130,7 +130,6 @@ namespace Xamarin.MMP.Tests
 
 				var logs = SetupAndBuildLinkedTestProjects (projects.Item1, projects.Item2, tmpDir, useProjectReference: false, setupDefaultNativeReference: noEmbedding);
 
-				Assert.False (logs.Item1.Contains ("mcs"), "Bindings project must not use mcs:\n" + logs.Item1);
 				Assert.True (logs.Item1.Contains ("csc"), "Bindings project must use csc:\n" + logs.Item1); 
 
 				var bgenInvocation = logs.Item1.SplitLines ().First (x => x.Contains ("bin/bgen"));