Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  6417b0a1de04d06c9b8b658423e39c53ac186b20

SetSiteLinkTest finally compatible with DataModel 1.0

so flattenArray. much really. very ouch.

Change-Id: Ifaf79735f2910982009a6594d3aef9eb323f2ed3