[PATCH 2 of 3] color: turn on by default (but for windows)

[Yuya Nishihara]

On Mon, 17 Apr 2017 20:44:16 +0200, Pierre-Yves David wrote:
> > hgext/color.py can also be removed
> > and marked as a builtin, but that isn't important.
> 
> I wanted to mimize the possible churn on stable if we have to backout 
> the change in default during the freeze. My plan is to clan this up 
> early in the 4.3 cycle if the changes survive in the 4.2 release.

Makes sense.