[msbuild] code cleanup (#607)

msbuild/Xamarin.MacDev.Tasks.Core/Tasks/CollectFrameworksBase.cs

@@ -1,12 +1,9 @@
-using System;
-using System.IO;
-using System.Linq;
+using System.IO;
 using System.Collections.Generic;
 
 using Microsoft.Build.Framework;
 using Microsoft.Build.Utilities;
 
-using Xamarin.MacDev;
 using Xamarin.MacDev.Tasks;
 
 namespace Xamarin.iOS.Tasks
@@ -39,7 +36,7 @@ namespace Xamarin.iOS.Tasks
 			var fwDir = Path.Combine (AppBundlePath, "Frameworks");
 			if (Directory.Exists (fwDir)) {
 				foreach (var fw in Directory.GetDirectories (fwDir)) {
-					if (!fw.EndsWith (".framework")) {
+					if (Path.GetExtension (fw) != ".framework") {
 						Log.LogWarning ("Found a directory within the Frameworks directory which is not a framework: {0}", fw);
 						continue;
 					}

msbuild/Xamarin.iOS.Tasks.Core/Xamarin.iOS.Common.targets

@@ -758,7 +758,7 @@ Copyright (C) 2013-2016 Xamarin. All rights reserved.
 			ToolPath="$(DSymUtilPath)">
 		</DSymUtil>
 
-		<!--- strip embedded frameworks -->
+		<!-- strip embedded frameworks -->
 		<SymbolStrip
 			SessionId="$(BuildSessionId)"
 			Condition="'$(IsMacEnabled)' And '$(MtouchDebug)' != 'true'"