bug#41544: 26.3; Possible incorrect results from color-distance

[Eli Zaretskii]

> From: Mattias Engdegård <mattiase@acm.org>
> Date: Wed, 3 Jun 2020 17:01:46 +0200
> Cc: tom@tromey.com, simon@polaris64.net, 41544@debbugs.gnu.org
> 
> 3 juni 2020 kl. 16.24 skrev Eli Zaretskii <eliz@gnu.org>:
> 
> > Not sure I understand completely: does this patch make the function
> > symmetric?
> 
> Yes, the patch both improves the accuracy and makes the function symmetric.

Then I think we should install it.