[CFT]: libedit update (NetBSD CVS 2009-12-28)

Hi;

I noticed that libedit is seriously outdated so I tried to sync it
with the upstream (NetBSD) tree.

For the time being I avoided the international support and
related changes since they move some files and, in general,
complicates getting things merged properly.

The resulting patch is here:

http://people.freebsd.org/~pfg/patches/patch-libedit-cvs20091228

With this update GNU readline support should work better
and we will be more in line with what is shipped in both
NetBSD and Darwin.

I also submitted some of our changes upstream but some
things like file completion and the code in tty.c have diverged
on NetBSD.

Please do let me know if there is anything strange.

I think for the next update we may probably just merge the
vendor branch directly.

best regards,

Pedro.