Multiarch Fixes - mediawiki

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Diff

diff --git a/debian/control b/debian/control
index 2bb0c4e94..2fe451295 100644
--- a/debian/control
+++ b/debian/control
@@ -67,6 +67,7 @@ Description: website engine for collaborative work
 Package: mediawiki-classes
 Architecture: all
 Depends: ${misc:Depends}
+Multi-Arch: foreign
 Description: website engine for collaborative work - standalone classes
  This package provides standalone classes from the remainder of the
  MediaWiki codebase. They do not call on any other portions of MediaWiki

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