libdiff: Implement diff coloring.

This patch got accidentally left out when libdiff was imported. The
rest of the code (command-line option etc.) was present, just not the
part that actually prints

libdiff: Implement diff coloring.

This patch got accidentally left out when libdiff was imported. The
rest of the code (command-line option etc.) was present, just not the
part that actually prints ANSI color codes.

Sponsored by: Klara, Inc.
Reviewed by: kevans
Differential Revision: https://reviews.freebsd.org/D46873

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Add 'contrib/libdiff/' from commit '9eb461aa4b61ab47855b2cee9e5b626a76888b5e'

git-subtree-dir: contrib/libdiff
git-subtree-mainline: f6d489f402c320f1a6eaa473491a0b8c3878113e
git-subtree-split: 9eb46

Add 'contrib/libdiff/' from commit '9eb461aa4b61ab47855b2cee9e5b626a76888b5e'

git-subtree-dir: contrib/libdiff
git-subtree-mainline: f6d489f402c320f1a6eaa473491a0b8c3878113e
git-subtree-split: 9eb461aa4b61ab47855b2cee9e5b626a76888b5e

Reviewed by: imp
Sponsored by: Klara, Inc.

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