License change: libevdev -> MIT

[Peter Hutterer]

Thanks to a copy/paste error many years ago, libevdev's COPYING file
contained the HPND sell variant [1], not the intended MIT license. This has
been fixed upstream with the 1.11.0 release which is currently hitting the
Fedora repos.

libevdev was always meant to be MIT, from the developer's perspective this
isn't a license change as such, it's more getting the paperwork in order.
From a legal perspective... IANAL.

Cheers,
   Peter

[1] https://spdx.org/licenses/HPND-sell-variant.html