- 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 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
. use section names instead of node names in generated menus
. pass on flags set with -D to TeX
. useless static libraries are not installed
. the newline after an @insertcopying is not output