Revert "Emit warning about renamed NuGet package on build"

This reverts commit f3eb383.

Author: bkoelman

Diff for: src/JsonApiDotNetCore.OpenApi/Build/JsonApiDotNetCore.OpenApi.targets

@@ -27,7 +27,6 @@
   <ItemGroup>
     <None Include="..\..\package-icon.png" Visible="false" Pack="True" PackagePath="" />
     <None Include="..\..\PackageReadme.md" Visible="false" Pack="True" PackagePath="" />
-    <None Include="Build\*.targets" Pack="True" PackagePath="build" />
   </ItemGroup>
 
   <ItemGroup>