RFA: Import a readline bugfix

[Daniel Jacobowitz <drow@mvista.com>]

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?

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer

			   READLINE PATCH REPORT
			   =====================

Readline-Release: 4.3
Patch-ID: readline43-001

Bug-Reported-by:   Thierry Vignaud <tvignaud@mandrakesoft.com>
Bug-Reference-ID:  <m2wurdqvo0.fsf@vador.mandrakesoft.com> (bug-readline)
Bug-Reference-URL: 

Bug-Description:

Pressing certain key sequences causes an infinite loop in _rl_dispatch_subseq
with the `key' argument set to 256.  This eventually causes bash to exceed
the stack size limit and crash with a segmentation violation.

Patch:

*** ../readline-4.3/bind.c	Thu Jan 24 11:15:52 2002
--- bind.c	Wed Jul 31 09:11:18 2002
***************
*** 312,316 ****
  	     and the function bound  to `a' to be executed when the user
  	     types `abx', leaving `bx' in the input queue. */
! 	  if (k.function /* && k.type == ISFUNC */)
  	    {
  	      map[ANYOTHERKEY] = k;
--- 312,316 ----
  	     and the function bound  to `a' to be executed when the user
  	     types `abx', leaving `bx' in the input queue. */
! 	  if (k.function && ((k.type == ISFUNC && k.function != rl_do_lowercase_version) || k.type == ISMACR))
  	    {
  	      map[ANYOTHERKEY] = k;