These are all custom-written, including a load of research in `git log`
to find the copyright holders for `girepository/meson.build` and
`girepository/gi-dump-types.c`.
With this, `reuse lint` raises no complaints about the `girepository/`
directory.
Signed-off-by: Philip Withnall <philip@tecnocode.co.uk>
Helps: #3155
