Re-enable FCS build on Jenkins Ubuntu

[dsyme]

As part of #4368 I had to disable the FCS build on Jenkins Ubuntu due to Mono version. This should now be addressed since moving to Ubuntu 16.04

[dsyme]

I ended up having to

1. simplify a .NET-SDK a few more project files under fcs/samples
2. find a solution for Build for desktop framework on non-windows platforms sdk#335 (where dotnet can't build .NET Framework projects out of the box on Linux/OSX - you can workaround by pointing it to the right reference assemblies).

The good news is that all of the following now work on both OSX and Windows (CI will test Linux) and all of them build/test/pack both netstandard2.0/netcoreapp2.0 and net45/net46.

dotnet restore fcs/FSharp.Compiler.Service.sln
dotnet build fcs/FSharp.Compiler.Service.sln
dotnet test fcs/FSharp.Compiler.Service.Tests/FSharp.Compiler.Service.Tests.fsproj
dotnet pack fcs/FSharp.Compiler.Service.sln

This means FCS testing and nuget packaging is now enabled and consistent across OSX and Windows.

[dsyme]

@dotnet-bot Test Ubuntu16.04 Release_default Build please

[dsyme]

WiIl merge, it's all fcs/...

[forki]

Awesome. Thanks for that Am 27.02.2018 01:56 schrieb "Don Syme" <[email protected]>:

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