The output of ExampleConfig_CreateFromFiles and ExampleConfig_Import
are different for Windows that for other platforms: They contain
internal/syscall/windows packages and unicode/utf16 not present in
the output for other platforms.
For golang/go#11811.
Change-Id: Id391fbeec8123616da86cb68fc3cefcd513b2493
Reviewed-on: https://go-review.googlesource.com/13032
Reviewed-by: Ian Lance Taylor <iant@golang.org>