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Add python3 packages to speed up piglit run. - lxml. An accelerated python xml library using libxml2 (http://lxml.de/) - simplejson. A fast C based implementation of the python json library. (https://simplejson.readthedocs.org/en/latest/) Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com> Reviewed-by: Michel Dänzer <mdaenzer@redhat.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7379>