RFA: Import a readline bugfix

[Elena Zannoni]

Daniel Jacobowitz writes:
 > I was working on an ornery completion bug this morning and stumbled across:
 >   http://ftp.gnu.org/gnu/readline/readline-4.3-patches/readline43-001
 > 
 > This patch fixes an infinite loop in readline on hitting certain keys - on
 > my terminal one of them is shift-delete, which I hit by accident pretty
 > frequently.  OK to commit this?
 > 

I have integrated all the official patches to the current version of readline.
Which include this one.


elena