Drop cargo-culted copyright statements

None of these copyrights apply to any files in this repository.

Copyright lists in FOSS projects tend to be always out-of-date when
compared to what law says about when copyright forms. Law also requires
interpretation case by case whether something is copyrightable or not.
Hence, if someone bothered to add a copyright line then they surely
expect to hold some copyrights in the works, so any such list would be
the minimum of possible copyrights holders.

All the files remaining in this repository right now were written from
scratch well after any of the listed copyright years, so the listed
copyrights cannot be true. The history can be found in
wayland/wayland-protocols!14 .
To avoid confusion, they are removed.

The license text itself has unknown copyrights according to
https://opensource.org/licenses/MIT

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
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