git-remote-mediawiki: remove import of unused open2

Signed-off-by: Célestin Matte <celestin.matte@ensimag.fr>
Signed-off-by: Matthieu Moy <matthieu.moy@grenoble-inp.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/mw-to-git/git-remote-mediawiki.perl

@@ -22,7 +22,6 @@
 binmode STDOUT, ":encoding(UTF-8)";
 
 use URI::Escape;
-use IPC::Open2;
 
 # Mediawiki filenames can contain forward slashes. This variable decides by which pattern they should be replaced
 use constant SLASH_REPLACEMENT => "%2F";