Fix broken 6502 test cases

[Miezekatze64]

This fixes the literals and divmod by ignoring l modifiers in printf and adding an unsigned division/rem for %u.
It also updates the test cases to expect 16bit outputs

[rexim]

@Miezekatze64 looks good! Thank you for figuring out what we expect from smol platforms such as uxn and 6502!