This was meant to be only an upgrade of how we set unix permission in
the updater to use .NET 7 new APIs, but I end up finding bugs along the
way.
Changelog:
- Remove direct usage of chmod to use File.SetUnixFileMode.
- Fix command line being broken when updating (#3744) but on
Ryujinx.Ava.
- Makes Ryujinx.Ava updater fallback to Ryujinx executable if current
name isn't found.
- Make permission setter function more generic.