win,tools: ignore linting for line breaks

Line breaks on Windows should be CRLF, but Node also supports LF.
Hence, do not check line breaks on Windows, when running
vcbuild jslint.

Fixes: https://github.com/nodejs/node/issues/6912
PR-URL: https://github.com/nodejs/node/pull/8785


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Bartosz Sosnowski <bartosz@janeasystems.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>