Behaviour of Windows-only tool tasks on other platforms

[SteveGilham]

Description

Prompted by the review comment

I guess I'd prefer throwing exception (as you can disable "Targets" via conditional targets already), but I can add that myself if I don't forget.

as an aide memoire

Repro steps

Please provide the steps required to reproduce the problem

1. Run tasks like FxCop.run or ILMerge.run (maybe any others?) on non-Windows platforms

Expected behavior

See quote above

Actual behavior

Complete no-op

Known workarounds

N/A

Related information

• Operating system -- any non-Windows