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/development/tools/godot/default.nix

@@ -33,10 +33,9 @@ in stdenv.mkDerivation rec {
 
   enableParallelBuilding = true;
 
-  buildPhase = ''
-    scons target=release_debug platform=x11 prefix=$out -j $NIX_BUILD_CORES \
-      ${lib.concatStringsSep " "
-          (lib.mapAttrsToList (k: v: "${k}=${builtins.toJSON v}") options)}
+  sconsFlags = "target=release_debug platform=x11";
+  preConfigure = ''
+    sconsFlags+=" ${lib.concatStringsSep " " (lib.mapAttrsToList (k: v: "${k}=${builtins.toJSON v}") options)}"
   '';
 
   outputs = [ "out" "dev" "man" ];