LICENSE-MIT,UNLICENSE: split licenses into separate files
And stop trying to please license detection libraries.
The merging was done to please the license detection library
underlying pkg.go.dev. Since pkg.go.dev treats dual licensed projects
as the intersection ("AND") of the licenses, and because the UNLICENSE
is not supported per
there is no reason not to use the once-license-per-file style
common to dual-licensed ("OR") projects.
Signed-off-by: Elias Naur <email@example.com>