[bug-diffutils] bug#20062: bug#20062: bug#20062: bug#20062: [PATCH] diff: add support for --color

[Paul Eggert]

Andreas Grünbacher wrote:

  * colors_style is never initialized and defaults to NEVER; it should
default to AUTO.

'grep' and 'ls' default to the equivalent of NEVER; shouldn't 'diff' do the 
same?