[Bug-readline] readline 6.3 and ncurses 6.0

[BERTRAND Joël]

        Hello,

	I'm develop for a long time an application that is statically linked 
against ncurses and readline (http://www.rpl2.net). This application 
contained readline 6.3 and ncurses 5.9 and ran like a charm. Last 
tuesday, I have replaced ncurses 5.9 by 6.0 one (and last 6.0 patches). 
I have seen that readline doesn't work anymore. For example, when I try 
to use backspace, readline interprets these backspace as backspace to 
delete characters from input but as spaces on screen :


RPL/2> azerty   u
             ^^^ 3 backspaces
1: 'azeu'

        If I replace libncurses.a 6.0 by 5.9, readline runs as expected.

        Machine : amd64 running Linux debian/testing
        Configuration flags :
--disable-shared --enable-static --enable-threads

        Regards,

        JB