Rename Linux universal release package from
`stockfish-ubuntu-x86-64-universal.tar.gz` to
`stockfish-linux-x86-64-universal.tar.gz` (and similar for the binary), as the
bundled binary should run on any Linux distro with glibc >= 2.35 (which is the
glibc version of the Ubuntu 22.04 build server).
Note that the Linux universal binary is built with static libstdc++ linkage, so
this adds no extra dependency.
This change will hopefully make it less confusing for users, and in line with
how we show it on stockfishchess.org (as Linux).
closes https://github.com/official-stockfish/Stockfish/pull/6760
No functional change
`stockfish-ubuntu-x86-64-universal.tar` goes from 94.8MiB to 67.4MiB (tar.gz)
Note that the CI code is written such that it easy to select other compression
schemes in the future (e.g. tar.xz) by simply changing the `archive_ext`
parameter.
closes https://github.com/official-stockfish/Stockfish/pull/6746
No functional change
