- Move texindex.awk to package texinfo as texindex(1) is part of
  and use this awk script

- Port the texinfo-zlib.patch to new version 6.6 to solve build problems 

- Update to version 6.6:
  * Language:
    . new commands @&, @ampchar{}
    . @cropmarks command removed
    . @ctrl is no longer recognised (it was a way to insert literal
      control characters in Info files, but deprecated since the
      time of Texinfo version 2)
    . \usebracesinindexestrue is no longer recommended for using braces in
      index entries, and has been a no-op for some time
  * texi2any
    . extension modules fixed to work with the "thread-safe locales" of
      Perl 5.28 and newer
    . some code changed to stop warnings being given by newer versions of Perl
    . for HTML output, use `id' to define link targets instead of the `name'
      attribute on <a>
    . A native-code implementation of the Texinfo parser has been included
      on an experimental basis, which makes texi2any a lot faster.  Set the
      `TEXINFO_XS_PARSER' environment variable to 1 to use.
    . changes to HTML output:
      . omit colon after node name in menus by default (use
        `MENU_ENTRY_COLON' to add it back)
      . no special CSS for commands like @smallexample
      . new customization variable `SECTION_NAME_IN_TITLE' to use the
        section name as the document <title>
      . use section names instead of node names in generated menus

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