RFC: Removing the DCO-1.1 provision in the copyright policy

Hi,

GLEP 76 has a special provision [1] that permits using kernel DCO intead
of our GCO:

> Alternatively, and if it is applicable, committers can certify their
> commits with the Linux Kernel DCO 1.1 [8]. This shall be indicated by
> adding (DCO-1.1) at the end of the Signed-off-by line. Using the
> Gentoo Certificate of Origin is strongly preferred.

This dates back to 2013.  According to a quick grep across default
branches of all repositories in git.gentoo.org, there is not a single
commit using this provision.  Therefore I'd like to propose that we
remove it and require GCO for all commits.

[1] https://www.gentoo.org/glep/glep-0076.html#certificate-of-origin

-- 
Best regards,
Michał Górny

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