wondershaper on windows

[zolia]

On windows we still attempt to launch wondershaper. This script should run only on Linux:

2019-11-05T21:35:40.356 DBG source/core/shaper/shaper.go:73 > Wondershaper healthcheck: starting
2019-11-05T21:35:40.359 WRN source/core/shaper/bootstrap.go:36 > Could not create wonder shaper, using noop error="wondershaper healthcheck failed: wondershaper executable not found: exec: "wondershaper": executable file not found in %PATH%"

[tadaskay]

This is correct behavior: it tries to healthcheck and then falls back to noop.

[zolia]

We should not be calling non-windows code at all on windows platforms. That's why there are +build directives.