Remove ppc64le from Travis CI
Remove ppc64le from Travis CI

There is not much sense in running CI on this arch as there are
no code paths specific to it, it only prolongs PR gating procedure.

OpenSCAP/openscap,OpenSCAP/openscap,OpenSCAP/openscap,OpenSCAP/openscap,OpenSCAP/openscap,OpenSCAP/openscap