removed CPPWinRT related imports from .vcxproj file to fix broken build

Author: REDMOND\jingf

Samples/SampleSharedLib/SampleSharedLib/SampleSharedLib.vcxproj

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="..\packages\Microsoft.Windows.CppWinRT.2.0.220131.2\build\native\Microsoft.Windows.CppWinRT.props" Condition="Exists('..\packages\Microsoft.Windows.CppWinRT.2.0.220131.2\build\native\Microsoft.Windows.CppWinRT.props')" />
   <ItemGroup Label="ProjectConfigurations">
     <ProjectConfiguration Include="Debug_NuGet|Win32">
       <Configuration>Debug_NuGet</Configuration>
@@ -250,14 +249,9 @@
     <None Include="packages.config" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
-  <ImportGroup Label="ExtensionTargets">
-    <Import Project="..\packages\Microsoft.Windows.CppWinRT.2.0.220131.2\build\native\Microsoft.Windows.CppWinRT.targets" Condition="Exists('..\packages\Microsoft.Windows.CppWinRT.2.0.220131.2\build\native\Microsoft.Windows.CppWinRT.targets')" />
-  </ImportGroup>
   <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
     <PropertyGroup>
       <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
     </PropertyGroup>
-    <Error Condition="!Exists('..\packages\Microsoft.Windows.CppWinRT.2.0.220131.2\build\native\Microsoft.Windows.CppWinRT.props')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.Windows.CppWinRT.2.0.220131.2\build\native\Microsoft.Windows.CppWinRT.props'))" />
-    <Error Condition="!Exists('..\packages\Microsoft.Windows.CppWinRT.2.0.220131.2\build\native\Microsoft.Windows.CppWinRT.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.Windows.CppWinRT.2.0.220131.2\build\native\Microsoft.Windows.CppWinRT.targets'))" />
   </Target>
 </Project>