mhwaveedit: fix src url (gna is dead) and use autoreconf for build

pkgs/applications/audio/mhwaveedit/default.nix

···
-{ stdenv, fetchurl, makeWrapper, SDL , alsaLib, gtk2, libjack2, ladspaH
+{ stdenv, fetchurl, makeWrapper, SDL, alsaLib, autoreconfHook, gtk2, libjack2, ladspaH
 , ladspaPlugins, libsamplerate, libsndfile, pkgconfig, libpulseaudio, lame
 , vorbis-tools }:
 
···
   version = "1.4.23";
 
   src = fetchurl {
-    url = "http://download.gna.org/mhwaveedit/${name}.tar.bz2";
-    sha256 = "010rk4mr631s440q9cfgdxx2avgzysr9aq52diwdlbq9cddifli3";
+    url = "https://github.com/magnush/mhwaveedit/archive/v${version}.tar.gz";
+    sha256 = "1lvd54d8kpxwl4gihhznx1b5skhibz4vfxi9k2kwqg808jfgz37l";
   };
 
-  buildInputs = [ SDL alsaLib gtk2 libjack2 ladspaH libsamplerate libsndfile
-     pkgconfig libpulseaudio makeWrapper ];
+  nativeBuildInputs = [ autoreconfHook ];
+
+  preAutoreconf = "(cd docgen && sh gendocs.sh)";
+
+  buildInputs = [
+     SDL alsaLib gtk2 libjack2 ladspaH libsamplerate libsndfile
+     pkgconfig libpulseaudio makeWrapper
+  ];
 
   configureFlags = "--with-default-ladspa-path=${ladspaPlugins}/lib/ladspa";