devpts in mach buildroots

[Warren Togami]

Ville Skyttä wrote:
> perl-IPC-Run from Extras devel CVS fails its test suite when built with
> mach.  It needs pseudo tty's and the mach chroot doesn't have devpts
> mounted, /dev/ptmx alone is not enough.
> 
> The attached quick and dirty patch adds devpts mounting to mach
> buildroots.  perl-IPC-Run builds fine here with it applied.
> 
> What do you think, would this be an useful/acceptable addition to mach?
> 

Just go ahead and commit.  Don't forget to bump the release or version 
or something too.

Warren