Use binmode to set stdout to raw when printing uploaded files.

The bug involved uploaded images not being decoded correctly.

wiki.pl

@@ -3132,6 +3132,7 @@ sub DoDownload {
       if @UploadTypes and not $allowed{$type};
     print GetHttpHeader($type, $ts, undef, $encoding);
     require MIME::Base64;
+    binmode(STDOUT, "raw");
     print MIME::Base64::decode($data);
   } else {
     print GetHttpHeader('text/plain', $ts);