ut99: update to 469c

Another update for this 20+ years old game 🙂

But I need help : "upstream" provides for the first time amd64 binaries in addition to the i386 ones, but i struggle on how to package this correctly.

It seems I can't define two packages with the same name (but different arch) in the yaml file (well i can define the two, but only one of them will be generated). For now I defined another package name (ut99-amd64) for those files, but it's not integrated correctly into the launcher. Any idea on how to handle this will be greatly appreciated 👍