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

pkgs/by-name/qr/qrencode/package.nix

@@ -1,11 +1,12 @@
 {
   lib,
   stdenv,
-  fetchurl,
+  fetchFromGitHub,
   pkg-config,
   SDL2,
   libpng,
   libiconv,
+  autoreconfHook,
 }:
 
 stdenv.mkDerivation (finalAttrs: rec {
@@ -19,12 +20,17 @@ stdenv.mkDerivation (finalAttrs: rec {
     "dev"
   ];
 
-  src = fetchurl {
-    url = "https://fukuchi.org/works/qrencode/qrencode-${version}.tar.gz";
-    sha256 = "sha256-2kSO1PUqumvLDNSMrA3VG4aSvMxM0SdDFAL8pvgXHo4=";
+  src = fetchFromGitHub {
+    owner = "fukuchi";
+    repo = "libqrencode";
+    rev = "v${version}";
+    hash = "sha256-nbrmg9SqCqMrLE7WCfNEzMV/eS9UVCKCrjBrGMzAsLk";
   };
 
-  nativeBuildInputs = [ pkg-config ];
+  nativeBuildInputs = [
+    pkg-config
+    autoreconfHook
+  ];
 
   buildInputs = [
     libiconv