Wrong `max-atomic-width` value in target spec? (`64`)

[boozook]

rust_dos/i586-rust_dos.json

Line 12 in 4daecbe

"max-atomic-width": 64,

[senormeow]

@boozook I generated a PR that allows fixes these issues and allows the program to compile (in release mode only)
#27

[boozook]

Thanks! 😊