[gold] Use linkify-sk for ignore comments.
[gold] Use linkify-sk for ignore comments.

Bug: skia:
Change-Id: I3eaa31ee129c7760d5c37a2fe192f02f46ee2bea
Reviewed-on: https://skia-review.googlesource.com/14606
Reviewed-by: Stephan Altmueller <43343ec95731c0e8daa7359daf7f2f3935582b24@google.com>
Commit-Queue: Ben Wagner <3ef7217be91069877d94f7907ce5479000772cd3@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot