It seems 354018efcd broke IPv6 IPs on older Qt
versions:
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FAIL: test_urls (qutebrowser.test.utils.test_urlutils.IsUrlTests) (url='2001:41d0:2:6c11::1')
Test things which are URLs.
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Traceback (most recent call last):
File "/var/lib/buildbot/slaves/slave/ubuntu-utopic/build/qutebrowser/test/utils/test_urlutils.py", line 168, in test_urls
self.assertTrue(urlutils.is_url(url), url)
AssertionError: False is not true : 2001:41d0:2:6c11::1