Fix usage with new version of goleveldb.
Fix usage with new version of goleveldb.

vincentbernat/aptly,scalp42/aptly,aptly-dev/aptly,scalp42/aptly,bsundsrud/aptly,gdbdzgd/aptly,vincentbernat/aptly,bsundsrud/aptly,neolynx/aptly,seaninspace/aptly,scalp42/aptly,smira/aptly,gdbdzgd/aptly,adfinis-forks/aptly,bankonme/aptly,gearmover/aptly,vincentbernat/aptly,ceocoder/aptly,bsundsrud/aptly,sobczyk/aptly,sobczyk/aptly,aptly-dev/aptly,ceocoder/aptly,ceocoder/aptly,smira/aptly,gearmover/aptly,bankonme/aptly,jola5/aptly,seaninspace/aptly,jola5/aptly,aptly-dev/aptly,smira/aptly,adfinis-forks/aptly,gearmover/aptly,neolynx/aptly,sobczyk/aptly,jola5/aptly,adfinis-forks/aptly,neolynx/aptly,bankonme/aptly,seaninspace/aptly,gdbdzgd/aptly