[msbuild] Import Xamarin.iOS.Analysis.targets (#283)

Update reference to maccore which includes
the bump to an update xamarin-analysis and
the corresponding Makefile changes.

mk/xamarin.mk

@@ -1,5 +1,5 @@
 ifdef ENABLE_XAMARIN
-NEEDED_MACCORE_VERSION := 0a5d57f00f03fd2033917d151641d36d81c6919a
+NEEDED_MACCORE_VERSION := d475b8b1f77fa66e4e9621da6ed99d1f85358c3b
 NEEDED_MACCORE_BRANCH := master
 
 MACCORE_DIRECTORY := maccore

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

@@ -84,6 +84,15 @@ Copyright (C) 2013-2016 Xamarin. All rights reserved.
 	<Import Project="$(MSBuildThisFileDirectory)$(MSBuildThisFileName).Before.targets" 
 			Condition="Exists('$(MSBuildThisFileDirectory)$(MSBuildThisFileName).Before.targets')"/>
 
+	<!-- *** Code Analysis Setup *** -->
+
+	<PropertyGroup>
+		<XamarinAnalysisTargetsFile Condition="Exists ('$(MSBuildThisFileDirectory)Xamarin.iOS.Analysis.targets')">$(MSBuildThisFileDirectory)Xamarin.iOS.Analysis.targets</XamarinAnalysisTargetsFile>
+	</PropertyGroup>
+
+	<Import Project="$(MSBuildThisFileDirectory)Xamarin.Analysis.targets"
+			Condition="Exists('$(MSBuildThisFileDirectory)Xamarin.Analysis.targets')" />
+
 	<PropertyGroup>
 		<!-- Switching to a new property allows us to potentially switch from iPhone to simulator builds
 			 dynamically based on the user's selection when starting the project. This allows us to