Instead of splitting remove / exclusion of unwanted files in 2-3 places
(`all` rule, `update` rule, and update script in some cases), install
the same files in debug & release builds, and exclude unwanted stuff
when generating the update.
This should finally fix the CI issue with OCR tests (since we don't
remove the `data/dict` & `data/tessdata` directories on release build
anymore).
kobov4 exists solely because there's a dedicated TC for it,
but we don't distribute binaries for it (it doesn't differ enough from
kobo, and experience has taught us that this kind of split was not a
great idea (e.g., kindle5 vs. kindlepw2)).
kobov5 targets a massively updated userland, and requires further
changes, including to the delivery mechanism, so it very much warrants a
dedicated package (re: #12401)
- forward unknown make targets to base
- add `cmake` and `staging` directories to ignored output artifacts
- drop `package.path` and `package.cpath` luarocks specific entries
