A source-built SDK has a few net4* targets: ``` $ find . -name net4* ./sdk/10.0.100-preview.5.25263.6/Microsoft/Microsoft.NET.Build.Extensions/net471 ./sdk/10.0.100-preview.5.25263.6/Microsoft/Microsoft.NET.Build.Extensions/net462 ./sdk/10.0.100-preview.5.25263.6/Microsoft/Microsoft.NET.Build.Extensions/net47 ./sdk/10.0.100-preview.5.25263.6/Microsoft/Microsoft.NET.Build.Extensions/net461 ``` Do we need these? Can we get rid of them? cc @ViktorHofer @baronfel