volumeicon: use github as source

Currently http://softwarebakery.com/maato is down. The alternative is
also based on http, not https. It seems nicer to use github.

In order to use GitHub as the source, autogen.sh needs to be executed.

pkgs/tools/audio/volumeicon/default.nix

···
-{ pkgs, fetchurl, lib, stdenv, gtk3, pkg-config, intltool, alsa-lib }:
+{ fetchFromGitHub, lib, stdenv
+, autoreconfHook, intltool, pkg-config
+, gtk3, alsa-lib
+}:
 
-stdenv.mkDerivation {
+stdenv.mkDerivation rec {
   pname = "volumeicon";
   version = "0.5.1";
 
-  src = fetchurl {
-    url = "http://softwarebakery.com/maato/files/volumeicon/volumeicon-0.5.1.tar.gz";
-    sha256 = "182xl2w8syv6ky2h2bc9imc6ap8pzh0p7rp63hh8nw0xm38c3f14";
+  src = fetchFromGitHub {
+    owner = "Maato";
+    repo = "volumeicon";
+    rev = version;
+    hash = "sha256-zYKC7rOoLf08rV4B43TrGNBcXfSBFxWZCe9bQD9JzaA";
   };
 
-  nativeBuildInputs = [ pkg-config ];
-  buildInputs = [ gtk3 intltool alsa-lib ];
+  nativeBuildInputs = [
+    autoreconfHook
+    intltool
+    pkg-config
+  ];
+
+  buildInputs = [
+    gtk3
+    alsa-lib
+  ];
 
   meta = with lib; {
     description = "A lightweight volume control that sits in your systray";
-    homepage = "http://softwarebakery.com/maato/volumeicon.html";
-    platforms = pkgs.lib.platforms.linux;
+    homepage = "http://nullwise.com/volumeicon.html";
+    platforms = platforms.linux;
     maintainers = with maintainers; [ bobvanderlinden ];
-    license = pkgs.lib.licenses.gpl3;
+    license = licenses.gpl3;
   };
-
 }