No legacy BSD pty's

[Kenneth Porter]

Just a heads-up to others who might run into this. I got an error from a 
commercial app (Lugaru Epsilon) after upgrading to FC2 that it couldn't 
open any pty's. (Pseudo tty's, used to create a virtual tty pair, typically 
for terminal emulation by programs like telnet and xterm.) It was because 
it was coded to use the legacy BSD pty's instead of the new SysV ones. The 
developer is working to add support for the latter, but meanwhile I'll need 
to to build a custom kernel with the legacy pty's enabled.