Bootstrap bug

[aristarh2704]

Bootstraping rustc on cygwin failed, because cygwin use another pathes, than windows.
Cargo cann't build project. It's need fix getting abspath on cygwin.

[steveklabnik]

Hi there! It has been a long time, and there's few details in this bug. I'm going to give it a close, but if you're still seeing this issue, please open a new bug with the exact commands you're trying, error messages, and other context. Thanks!