Update the interwiki cache

The interwiki cache is a cache of meta:Interwiki map, which maps interwiki prefixes to URLs

This is how it appears to be updated:

mwscript extensions/WikimediaMaintenance/dumpInterwiki.php \
  -o /home/wikipedia/common/php/cache/interwiki.cdb \
  --protocolrelative
sync-common-file php/cache/interwiki.cdb Updating interwiki cache

note

replace `php` in above path by the appropriate php-1.XXwmfY value

Although the cache is tracked in subversion (current wmf branch), any .cdb files is ignored. You do not need to commit the update back in subversion.