This is left-over from #1148

We are building pwrshplugin.dll for FullCLR build, but we need it for Nano server as well.
Nano server is a little bit trickier, because it requires installing of https://developer.microsoft.com/en-US/windows/downloads/windows-10-sdk

Message Compiler

We use mc.exe for Full build to compile native resources and it fails in CI
https://ci.appveyor.com/project/PowerShell/powershell/build/0.4.0.2558#L206 (this is build from master)

There are two problems:

• Fix the failure
• Find out why it didn't fail the build and fix this: such errors must fail the build: Answer: because I didn't use Start-NativeExecution helper function.