There's a closed pull request on the void-packages repository

Fix fillets-ng not including game data
https://github.com/void-linux/void-packages/pull/37720

Description:
Basically all I did was copy `do_install` from the `gnu-configure` build style and add a couple lines to copy the game data into `DESTDIR` as well. I chose to install it to `/usr/share/games/fillets-ng` because that is where Fillets looks for the game data by default.

#### Testing the changes
- I tested the changes in this PR: **YES**

#### Local build testing
- I built this PR locally for my native architecture, x86_64-glibc