treewide: use scons setup hook

Lots of packages can use it. Here is the list:

- jackmix
- klick
- mixx
- nova-filters
- rhvoice
- giv
- mypaint
- swift-im
- bombono
- mapnik
- serf
- nuitka
- pyexiv2
- godot
- hammer
- toluapp
- btanks
- dxx-rebirth
- endless-sky
- globulation
- the-powder-toy
- fceux
- gpsd
- mongodb
- rippled
- mariadb
- lprof

pkgs/applications/audio/rhvoice/default.nix

@@ -1,5 +1,5 @@
-{ stdenv, lib, pkgconfig, fetchFromGitHub, scons, python, glibmm, libpulseaudio, libao
-}:
+{ stdenv, lib, pkgconfig, fetchFromGitHub, scons
+, python, glibmm, libpulseaudio, libao }:
 
 let
   version = "unstable-2018-02-10";
@@ -30,14 +30,6 @@ in stdenv.mkDerivation rec {
 
   patches = [ ./honor_nix_environment.patch ];
 
-  buildPhase = ''
-    scons prefix=$out
-  '';
-
-  installPhase = ''
-    scons install
-  '';
-
   meta = {
     description = "A free and open source speech synthesizer for Russian language and others";
     homepage = https://github.com/Olga-Yakovleva/RHVoice/wiki;