5.2.2 Regression - Paket incorrectly adds reference to System assemblies on full frameworks #2469

Description

When a .NET 4.5 project depends upon Microsoft.Bcl, paket incorrectly adds a reference to System.IO, System.Runtime and System.Threading.Tasks. Previous versions did not do this.

Repro steps

Download & save all the files found in https://gist.github.com/optical/102a08bd9fd71684195a6e3285b7ab8c

1. Install paket 5.2.2
2. Run paket install

Expected behavior

Those 3 system libraries are not referenced

Actual behavior

They are infact referenced (5.2.1 and earlier did not do this)

Known workarounds

Use version 5.2.1. Unsure if any other settings work around this.