Updated mediawiki/extensions
Project: mediawiki/extensions/Echo  e6769b3391c2753102f7cbc8aff629ba3e5d7f5b

Accept diffs formatted by UnifiedDiffFormatter

GNU diff and mediawiki's internal UnifiedDiffFormatter do not have
the same default formats.  Here we adjust the output of the internal
diff to match gnu diff as is expected by DiscussionParser.
Bug: 41689

Change-Id: Ib83cacab41adfbdfa8e122c0494b266d4caefc83