autopktests: skip test runs on ppc64el

Michael Prokoprequested to merge
mika/cppcheck:mika/1099986 into master

The problem isn't reproducible yet, and there are also no reports that cppcheck itself does not work on ppc64el, see #1099986.

Skip autopktests runs on ppc64el for now.

Thanks to @elbrus for feedback how to handle this.

Edited by Michael Prokop

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