Updated mediawiki/extensions
Project: mediawiki/extensions/Scribunto  1492ac3d68f26d86f867e3b4e120ff213e09c59e

Avoid running all of mw.lua twice

LuaStandalone only uses 2 functions from mw.lua, so move them to their own
file to avoid running the whole thing twice.

Change-Id: Ia4d58f44be17f7a71666dbe750e66d9d90cb5c2f