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/libraries/swiften/default.nix

@@ -1,8 +1,9 @@
-{ stdenv, python, fetchurl, openssl, boost }:
+{ stdenv, python, fetchurl, openssl, boost, scons }:
 stdenv.mkDerivation rec {
   name    = "swiften-${version}";
   version = "4.0.2";
 
+  nativeBuildInputs = [ scons];
   buildInputs           = [ python ];
   propagatedBuildInputs = [ openssl boost ];
 
@@ -10,16 +11,17 @@ stdenv.mkDerivation rec {
     url    = "https://swift.im/downloads/releases/swift-${version}/swift-${version}.tar.gz";
     sha256 = "0w0aiszjd58ynxpacwcgf052zpmbpcym4dhci64vbfgch6wryz0w";
   };
-  
-  buildPhase = ''
-    patchShebangs ./scons
-    ./scons openssl=${openssl.dev} \
-            boost_includedir=${boost.dev}/include \
-            boost_libdir=${boost.out}/lib \
-            boost_bundled_enable=false \
-            SWIFTEN_INSTALLDIR=$out $out
+
+  sconsFlags = [
+    "openssl=${openssl.dev}"
+    "boost_includedir=${boost.dev}/include"
+    "boost_libdir=${boost.out}/lib"
+    "boost_bundled_enable=false"
+  ];
+  preInstall = ''
+    installTargets="$out"
+    installFlags+=" SWIFT_INSTALLDIR=$out"
   '';
-  installPhase = "true";
 
   meta = with stdenv.lib; {
     description = "An XMPP library for C++, used by the Swift client";