msh + cmdline editing is broken

[Mike Frysinger]

this was working in busybox-1.4.1, but broke between that and 
busybox-1.9.0 ... the quick test is to do `make allnoconfig` and then turn on 
just msh and command line editing.  then when you run msh, do:
$ ls<ctrl+c>
$ ls<enter>
lsls: command not found
(so you type "ls", hit CTRL+C, then type "ls" again followed by return)

also, if you send just EOF to kill the shell (ctrl+d), you get a new prompt 
instead of exiting ...

perhaps someone more familiar with the new common command line editing can 
track down the issue quickly ... otherwise i'll be banging on it next week
-mike
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