Fixes #2744

[styx]

Initial version, awaiting for review (:

[josevalim]

Thanks! However, relative_to already uses split which normalizes the drive letter for windows (which is the only case we care about). My suggestion would then be to simply add the tests you added to the a new test named relative_to_win around here: https://github.com/elixir-lang/elixir/blob/master/lib/elixir/test/elixir/path_test.exs#L32

What do you think?

[styx]

Yeah, you are right, I just checked the test file and found a strip_drive_letter_if_windows in a test file. This is really tricky (: I'll move the tests and remove my own wheel.

[styx]

Originally I also was thinking about the same processing of windows paths both on Linux and windows.