treewide: Maintainer: GNUtoo: clarify the maintainer situation

The status quo is that any Parabola hacker is expected to (be able to)
modify any packages, and having a single maintainer of a package
discourages that practice as people would typically send a patch to
the maintainer instead of pushing it directly.

So for a start we can add common maintainership on package lacking any
"Maintainer: " header for packages in repositories that are supposed
to be maintained.

As for finding who worked on a given package (in case it could be
needed), the git log should have all the information.

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

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