Dependency on deprecated wlroots noop backend

[Eloitor]

I can't build goose from source because of the obsolete dependency on wlr/backend/noop.h

./include/goose.h:7:10: fatal error: 'wlr/backend/noop.h' file not found
    7 | #include <wlr/backend/noop.h>
      |          ^~~~~~~~~~~~~~~~~~~~
1 error generated.
make: *** [makefile:56: goose] Error 1

[blobject]

Starting from scratch would probably be best, since it's been a few years since this was built. But I will place current codebase in a new branch and try to fix this there.