Included the 70 byte version and a 72 byte version.

This is because the 70 byte version relies on the rest of ROM area being
set to FF, which open_agb_firm does but official AGB_FIRM does not, so I'm
unsure if it's allowed in that case.

no$gba "claims" the rest of ROM area is FF-filled in the debugger...
 ...but its svcCpuSet copies zeroes!

As for the other emulators, none of them even try <3