[mono] Updates Xamarin.IoT.Sdk (#3)

git@github.com:xamarin/xamarin-iot.git
6c570d5c7ade7ffc9b647f453832eee7d27ed37e
`src/IDE/Sdks/Xamarin.IoT.Sdk/` after make

Author: netonjm

sdks/Xamarin.IoT.Sdk/Sdk/Sdk.targets

@@ -11,5 +11,5 @@ Copyright (C) Microsoft Corp. All rights reserved.
 -->
 <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Project="$(MSBuildSdksPath)\Microsoft.NET.Sdk\Sdk\Sdk.targets" Condition="Exists('$(MSBuildSdksPath)\Microsoft.NET.Sdk\Sdk\Sdk.targets')" />
-  <Import Project="$(MSBuildThisFileDirectory)..\build\Xamarin.IoT.targets" Condition="'$(OS)'=='Unix' AND Exists('$(MSBuildThisFileDirectory)..\build\Xamarin.IoT.targets')" />
+  <Import Project="$(MSBuildThisFileDirectory)..\build\Xamarin.IoT.targets" Condition="Exists('$(MSBuildThisFileDirectory)..\build\Xamarin.IoT.targets')" />
 </Project>

sdks/Xamarin.IoT.Sdk/build/Xamarin.IoT.Core.dll

@@ -10,7 +10,4 @@ Copyright (C) Microsoft Corp. All rights reserved.
 ***********************************************************************************************
 -->
 <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <PropertyGroup>
-    <TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
-  </PropertyGroup>
 </Project>