Clean out some package project clutter.

Author: StephenMolloy

src/Packages/Packages.csproj

@@ -30,12 +30,6 @@
     <None Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform\build\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.targets" />
     <None Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.Extensions.targets" />
     <None Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform\build\net472\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.Extensions.targets" />
-    <None Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform\tools\Roslyn46\Microsoft.CSharp.Core.targets" />
-    <None Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform\tools\Roslyn46\Microsoft.Managed.Core.targets" />
-    <None Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform\tools\Roslyn46\Microsoft.VisualBasic.Core.targets" />
-    <None Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform\tools\Roslyn472\Microsoft.CSharp.Core.targets" />
-    <None Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform\tools\Roslyn472\Microsoft.Managed.Core.targets" />
-    <None Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform\tools\Roslyn472\Microsoft.VisualBasic.Core.targets" />
     <None Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform\content\config.install.xdt" />
     <None Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform\content\config.uninstall.xdt" />
     <None Include="**\*.ps1" />