Robert Mader aee3fae721 wayland: Add support for local protocols
This proved to be helpful for previous protocol experiments, so let's
upstream it. Inspired by the corresponding code in Weston.

Protocols need to be placed in a `protocols` subdirectory and can be
declared in the following way in `meson.build`:
```
['color-management-v1', 'internal' ],
```

Note the `v1` being part of the name.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/9186>
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