Update tex-hyperref{,-doc} to 6.81a.

Changes:
    * Patch for longtable takes package arydshln into account.
    * Language definitions for \autoref are provided automatically
      without global or package language options if babel is loaded
      before.
    * pdfencoding=auto: Escape TeX characters in .out file after
      successful conversion to PDFDocEncoding (or subset).
    * nameref 2.40: Support of environment `description'.

(minskim)