[v6.d REVIEW] Loosen IO::Path::Win32.absolute test
[v6.d REVIEW] Loosen IO::Path::Win32.absolute test

Do not force implementations to use the same path separator
that was used during path's creation. Simply test the combiners
on existing seps don't cause addition of another sep before it.

Orig: https://github.com/perl6/roast/commit/8ee0a0a6a

dogbert17/roast,perl6/roast,dogbert17/roast