Follow-up to Iacd6a8250: remove reference to repack-libmemcached10

Previous patch set it to ensure => absent and merged over an hour ago.
The file should therefore be purged everywhere, and this reference can be
removed.

Change-Id: I6e7874e61024dd1995070557637e682ce1f7c8b9
Merge "Follow-up to Iacd6a8250: remove reference to repack-libmemcached10" into production