System.dat missing many bios

[ahrib]

The system.dat file in this repository is missing many BIOS files, and other optional files that are placed in the RetroArch system directory.

System dat (https://github.com/libretro/libretro-database/blob/master/dat/System.dat

examples of missing files (there are many more)

• https://docs.libretro.com/library/vice/#c64-fastaccurate
• https://docs.libretro.com/library/puae/#bios
• https://docs.libretro.com/library/dosbox_pure/#mpu-401-midi-device-emulation-through-munt
• https://docs.libretro.com/library/mame2003_plus/#audio-samples

[RobLoach]

Good catch! Would love some help in updating it 👍