Log Message:
Update tex-hyperref{,-doc} to 6.81y.

Changes:
    * Allowing driver tex4ht if XeTeX is running (htxelatex).
    * Destination names (\hyper@makecurrent) now use
      the original definition of \@arabic to avoid
      trouble with redefined \@arabic (polyglossia/arabic).
    * Fix for draftmode, because .out file wasn't written.
    * Fix for driver hpdftex.def (undefined \pdf@draftmode).
    * Driver hpdftex.def: Use of \pdfdraftmode.
    * Driver pdfmark.def: Math mode respected in links.
    * Some unnecessary code removed in \LT@p@ftntext (GL).
    * Radio buttons: small fix, escaping values and adding /DV.
    * Temporary fix for \ltx@LocalAppendToMacro until next bundle update.
    * Version check added for driver files.
    * Field options `altname' and `mappingname' added.
    * \SpecialDvipdfmxOutlineOpen is set in case of XeTeX.
    * Broken error messages because of broken \Hy@Error fixed.