Attempt to fix the Lua version situation

[melak]

Drawing heavily on #589 by @dlbeer, attempt to fix the utter nonsense pkg-config and all various distributors brought on the world by

• Normalising 'lua-X.Y' and 'luaXY' notations to mean the same thing
• Handle both notations existing on the system correctly
• Picking the numerically highest version

There is also an option to override this autodetection mechanism by setting the LUA_PKGNAME environment variable prior to kicking a build off, resulting in the specified Lua package to be used.

Tested to be working on FreeBSD 13.1, Ubuntu 22.04 and Debian 11.

Ping @dlbeer @bapt @andmarti1424

[andmarti1424]

thanks for your patch. will check it out

[andmarti1424]

@melak Merged! Thanks for your patch!!