Updated mediawiki/extensions
Project: mediawiki/extensions/CleanChanges  0cf4c09e75dd0646a4625acfd4e10ce5a3efb728

Provide own arrow images and methods

Copied from mediawiki/core. Doing this is compatible with older
MediaWiki versions, too.

Bug: 69676
Change-Id: Ieb5bb6f908a273321d49a56c9ead0b267c9280a7