[PATCH] update to the latest libedit version and remove libreadline deps

[Baptiste Daroussin]

Yet another version of the patch, I hope the last one
http://people.freebsd.org/~bapt/update-libedit.patch
Everything should be working as it used to do before.

Now gdbtui is almost working. why almost because everything works
except Ctrl-D (EOF), I know where the bug is (lib/libedit/read.c :
function: FUN(el,gets)(EditLine *el, int *nread), the read pb is in
readchar I guess) but I can't find a way to fix it and it seems to me
a really minor regression. I think we can live with this as this bug
appear only when libedit doesn't directly gets its input but get is
through a third party interface (ncurses in that case) and gdbtui is
the only program in base working like this.

Also thanks for the information about exp-run, if anyone is about to
accept this patch and wanted to commit it, I'll follow those
informations.

regards,
Bapt