Fix readline for platforms without <wchar.h>

[Mark Kettenis]

   From: Elena Zannoni <ezannoni@redhat.com>
   Date: Mon, 26 May 2003 11:38:02 -0400

   Mark Kettenis writes:
    > There is a problem with one of our local GDB fixes for readline:
    > 
    > 2003-03-03  Kris Warkentin  <kewarken@qnx.com>
    > 
    > 	* aclocal.m4: Cause wcwidth check to substitute
    > 	HAVE_WCWIDTH for building.
    > 	* Makefile.in: Add wcwidth object to lib if required.
    > 	* shlib/Makefile.in: Likewise.
    > 	* configure: Regenerate.
    > 	
    > OK to check this in Elena?

   Ok with me.

Checked in,

Mark