Create binfmt support files

[slp]

After #23 gets merged, krun will be capable of acting as a binfmt interpreter for x86_64 binaries on aarch64 machines. We should create the binfmt support files, just qemu-user-static does, to package managers can install them on the host.

[RossComputerGuy]

Would be cool, does this mean FEX wouldn't have to be a requirement and other emulators like box64 would work?