New segac2 romsets

[arcadez2003]

No description provided.

[arcadez2003]

@amadvance just ignore these errors their likely to be caused by me splitting the commits rather than doin a
combined squash for both segac2.c and mamedriv.c at the same time, so the driver rom decs vs mamedriv
rom decs checks are likely getting messed up due to the split hence the errors.

i've seen this before many times im confident everything will work out in the end :)

/usr/bin/ld: obj/mame/linux/blend/mamedriv.o:(.data.rel.ro+0x6198): undefined reference to driver_ssonicbr' /usr/bin/ld: obj/mame/linux/blend/mamedriv.o:(.data.rel.ro+0x61a0): undefined reference to driver_ooparts'
/usr/bin/ld: obj/mame/linux/blend/mamedriv.o:(.data.rel.ro+0x6230): undefined reference to `driver_headonch'