Oddities in ECL tests on Linux

[Faré]

> The :sockets module is available for both Windows and Unix platforms in ECL.
>
Procrastinating at work, I looked and the non-portable module we
previously moved from, and it was :serve-events, not :sockets.

I created !104 with the two fixes by Marius:
https://gitlab.common-lisp.net/asdf/asdf/merge_requests/104

I think we should release 3.3.3, unless Didier (or someone else) wants
to also complete !103.

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