add another filename that shouln't be matched as error

This procedure must surely win the prize for the lamest error handling
mechanism ever conceived.

Change-Id: I90d2a1160ff3e1e870e9ca3f03c92436398c3b7f
Reviewed-on: https://gerrit.libreoffice.org/3595Reviewed-by: David Tardon <dtardon@redhat.com>
Tested-by: David Tardon <dtardon@redhat.com>

solenv/bin/modules/installer/control.pm

@@ -334,6 +334,7 @@ sub check_logfile
         $compareline =~ s/error\.py//g;     # removing all occurrences of "error.py"
         $compareline =~ s/error\.cpython-33\.py[oc]//g;  # removing all occurrences of "error-cpython"
         $compareline =~ s/libgpg-error-0.dll//g;
+        $compareline =~ s/Error-xref\.html//g;
 
         if ( $compareline =~ /\bError\b/i )
         {