Updated mediawiki/extensions
Project: mediawiki/extensions/CirrusSearch  75c9b1902582494ee4d8f653cdf6103f51751998

Bail early if another script is queueing jobs

If another script is queueing index build jobs for the same wiki then it'll
wait for them to empty so the current execution doesn't have to.

Change-Id: I3b5994cdb00406ee6b6889f4680e86822364daf4