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/video/bombono/default.nix

@@ -35,16 +35,10 @@ stdenv.mkDerivation rec {
     libxmlxx ffmpeg enca
     ];
 
-  buildPhase = ''
-    scons PREFIX=$out -j$NIX_BUILD_CORES -l$NIX_BUILD_CORES
-    '';
+  prefixKey = "PREFIX=";
 
   enableParallelBuilding = true;
 
-  installPhase = ''
-    scons install
-    '';
-
   meta = {
     description = "a DVD authoring program for personal computers";
     homepage = "http://www.bombono.org/";