Remove the copyright handling via util/copyrights

Merged Ondřej Surý requested to merge ondrej/remove-util-copyrights-v9_16 into v9_16

The copyright handling has been long obsolete, the works is covered as whole by the COPYING/LICENSE file even if a specific file doesn't have a copyright header.

The important thing to remember here is that any work is covered by a copyright law and by explicitly giving it license we provide extra rights to the users of the works.

(cherry picked from commit 09c32a8d)

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