End supporting output=soap12|ucn for HTML5origin/masterorigin/HEAD

For more than a year now, the output from all `output=soap12` and
`output=ucn` requests for checking of HTML documents has included a
prominent warning:

> The method you used to check this document relies on an obsolete
> interface that will become permanently unavailable in the near future.

See https://github.com/w3c/markup-validator/commit/1b12fe496bb457950944782f133f547cee3cef56

So any client software that’s checking HTML5 documents and has continued
to rely on `output=soap12` and `output=ucn` output has had sufficient
warning, and it’s now time to permanently disable it.

1 files changed, 0 insertions, 2 deletions

diff --git a/httpd/cgi-bin/check b/httpd/cgi-bin/check
index c238f21..93c7c8f 100755
--- a/httpd/cgi-bin/check
+++ b/httpd/cgi-bin/check
@@ -3362,8 +3362,6 @@ sub self_url_file
 
 sub redirect_html5_requests
 {
-    return if ($File->{Opt}->{Output} eq 'soap12');
-    return if ($File->{Opt}->{Output} eq 'ucn');
     return if not($CFG->{External}->{HTML5});
     if ($File->{'Direct Input'} || $File->{'Is Upload'}) {
         my $hash = $File->{'Direct Input'} ? "#textarea" : "#file";