Error building with 6.0.100-preview.6.21376.2

[jonathanpeppers]

Context: dotnet/android#6131

Our build is hitting an error such as:

CSC : error CS1705: Assembly 'illink' with identity 'illink, Version=6.0.100.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' uses 'Mono.Cecil, Version=0.11.4.0, Culture=neutral, PublicKeyToken=50cebf1cceb9d05e' which has a higher version than referenced assembly 'Mono.Cecil' with identity 'Mono.Cecil, Version=0.11.3.0, Culture=neutral, PublicKeyToken=50cebf1cceb9d05e'

I was able to reproduce this with dotnet new classlib and adding a class that uses:

<PackageReference Include="Microsoft.NET.ILLink" Version="6.0.100-preview.6.21376.2" />

.binlog included: foo.zip

[jonathanpeppers]

/cc @sbomer

[mateoatr]

Dup of #2173. Should be fixed by #2174.