Fixed the "Solaris Y2K10" bug

Got back to Solaris/qemu Y2K10 bug. The name turned out to be misleading because a) it's not a Solaris bug and b) it's not a Y2K10 bug.

The reason for the bug was someone mixing hexadecimal and decimal values. Gonna check if there are more such places and send the trivial fix later.

Submitted SunOS 4.1.4 & Solaris 2.2 fix upstream

Sent upstream the serial port patch. The patch allows booting SunOS 4.1.4 and Solaris 2.2.

Booting Solaris 2.2 is more tricky than SunOS 4.1.4, since it doesn't support SPARCStation-5. It has to be started in SS-20 emulation.

Will update the how-to shortly.