bug#13293: 24.2.91; eshell completion cycles fail in pre-test

[Glenn Morris]

Charles Rendleman wrote:

> A prescription for exhibiting the bug
>
> $ mkdir -p t/test-1 t/test-2 t/test-3
> $ emacs -Q -nw
> M-x eshell
> type cd t/<TAB>
> expands to 'cd t/test-3'
> pressing repeated <TAB>s does not cycle t/test-1, t/test-2, t/test-3

Looks like we need to add eshell-pcomplete to the list in the function
pcomplete:

(memq last-command '(pcomplete
                     pcomplete-expand-and-complete
                     pcomplete-reverse))