The native tar tool is much faster than python's tarfile implementation. We
should try to extract using it when possible.
Some versions of tar do not support the --wildcards option, so we fallback to
using python's version in this case since extracting a subset of the files
using python is usually faster than extracting all of the files with the native
Add a special case for web-platform tests to extract everything using the
native tool instead of trying to filter. The filters are global to all test
packages currently being downloaded/extracted, but we need everything from the
web-platform tests archive anyway.