The standalone Amiberry scans rom_path, ROMs below its content root by
default, for the ROMs of its database, without descending into
folders, and reads rom.key beside the Kickstart and the MT-32 ROMs
from mt32-roms. Those entries now carry standalone_path relative to
it, the four Kickstart labels holding slashes flattened. The kick*.rom
names stay the libretro build's.
Batocera's config_directories reads its rom_path save, KNULLI reuses
it. On Batocera, KNULLI and RetroPie the ROMs move from the BIOS root
to bios/amiga.