Fix typo
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Remove git repack.

It should be part of the import script, which calls git gc --aggressive.
Add another lesson learned
Use the commit graph to automate the git import

Locating by hand the places where reference files can be injected
and removed doesn't work, because there are many initial commits,
and many branches carrying the reference files downstream.

Automate the process by enhancing import-dir.pl to process the
git fast-export blocks as required.