Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  71d72fda7e71025911b9524ddacb882e626ddbe4

Remove require for 'includes/Exception.php' in core

1) appears not needed at all
2) references a file that has split up and moved into an includes subdirectory

Bug: 63008
Change-Id: I406fc095db02f2a5da10fcc85b0387bc809295d8