resolve_local_file now tries the path: field basename when name:
lookup fails. Fixes 139 PCem false positives where descriptive
names ("MDA font ROM") didn't match actual filenames (mda.rom).
Also add 3 QEMU firmware (MacROM.bin, bios_loongson3, pmon_2e).
Cross-reference path: fallback already added. 149/149 tests pass.
VICE: basic, chargen, kernal for x64sdl libretro core.
QEMU: SeaBIOS 1.16.3 + VGA BIOS from system package.
PCem: MDA font ROM from PCem v17 ROM set.
Freedoom: freedoom1.wad + freedoom2.wad for prboom.
Commander X16: rom.bin R49 from x16-rom releases.
Apple IIGS: ROM01 from asimov mirrors.
DSi: NDS_Bios7i, NDS_Bios9i, DSi_Firmware, SGB_(JU).