Ian Wienand a58ad34a5c mirror-update: restore -t to rsync commands
We found that new data (since we removed -t) was no correctly being
skipped for re-download.  We have found that this doesn't happen with
-t on later rsyncs, which have included fixes for -t to not touch the
timestamps if things are not updated.  We have updated mirror-update
to Focal that has this rsync, so restore the flag.

Change-Id: I3fa16dbf6487a442549c540796807ef4916d4e6e
2020-06-19 12:27:46 +10:00
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