[Ecls-list] Small fix for CLX demos

[David_Creelman at pa.com.au]

Hi,
Please find attached a small fix for the clx demos that come with CLX
in ECL.
This patch simply uses (open-default-display) which works on ECL. The
default display opening mechanism doesn't work on ECL.
This patch makes CLX work in the same way as SBCL CLX.

src/clx/demos/clx-demos.lisp....
39c39
<             #+(or sbcl ecl)
---
>             #+sbcl
43c43
<             #-(or cmu sbcl ecl)
---
>             #-(or cmu sbcl)

(Apologies for mangling up the output of diff a bit).

Regards
David