qrencode: update src url, use autoreconfHook

The source tar is no more available at
https://fukuchi.org/works/qrencode/qrencode-4.1.1.tar.gz

E.g.

    $ curl -I 'https://fukuchi.org/works/qrencode/qrencode-4.1.1.tar.gz'
    HTTP/1.1 404 Not Found
    Date: Sat, 17 May 2025 07:13:20 GMT
    Server: Apache/2.4.62 (Debian)
    Strict-Transport-Security: max-age=31536000
    Content-Type: text/html; charset=iso-8859-

However, we can download it from the official repository on GitHub as mentioned
in the project's home page[1].

To make the package build, we use autoreconfHook to mimick the repo's
`autogen.sh` because the GitHub repo does not contain the configure script as
mentioned in the project's README[2]:

> If there is no "configure" script in the source code directory, run
> "autogen.sh" at first to generate it - this is mandatory if you downloaded
> the source from GitHub.

[1] https://web.archive.org/web/20250413215821/https://fukuchi.org/en/works/qrencode/
[2] https://github.com/fukuchi/libqrencode/blob/50b3e5725cafccfde038c0833cdaa5b1c28491e2/README.md#compile--install

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