[PATCH STABLE] pathutil: use util.pathto() to calculate relative cwd in canonpath()

[Yuya Nishihara]

On Thu, 02 Nov 2017 21:16:32 -0400, Matt Harbison wrote:
> # HG changeset patch
> # User Matt Harbison <matt_harbison at yahoo.com>
> # Date 1509669331 14400
> #      Thu Nov 02 20:35:31 2017 -0400
> # Branch stable
> # Node ID 7d799a9800793cb5f1c10ce7269c31e1c7b1285a
> # Parent  95f54cec00258ffa4caa8df38e4ecb265aa7a0a3
> pathutil: use util.pathto() to calculate relative cwd in canonpath()

Queued for stable, thanks.