[xorriso] ISO 9660:1999 rename

[Mingye Wang]

Hi there,

ISO-9660:1999 became ISO-9660/Amd 1:2013, an official ISO standard
(albeit not an official level 4), in 2013. It may be appropriate to
change some references in xorriso accordingly.

I've already done it for mkisofs[1], but I'm having some trouble
deciding what to change in xorriso (do we make a new -compliance
option? do we change drive_mgt.c output? definitely change the
texinfo, right?), so I decided to just bump a message your way.

[1]: 
https://codeberg.org/Artoria2e5/schilytools/commit/5b380fd423ff2d973d744ad6fb0ddc22ca71a527

Regards,
Mingye Wang (Artoria2e5)