Fix building projects restored with NuGet 5.7#14517

Merged

dsplaisted merged 2 commits intodotnet:release/5.0.1xxfrom dsplaisted:nuget-restore-compat

Nov 20, 2020

+104-61

Commits on Nov 11, 2020

Remove dead code, rename NuGet.exe restore command
dsplaisted
committed

Commits on Nov 12, 2020

Fix building projects restored with NuGet 5.7
dsplaisted
committed