treewide: cmake buildInputs to nativeBuildInputs, minor cleanups

pkgs/development/libraries/liquidfun/default.nix

@@ -1,6 +1,6 @@
 { stdenv, requireFile, cmake, libGLU, libGL, libX11, libXi }:
 
-let 
+let
   sourceInfo = rec {
     version="1.1.0";
     name="liquidfun-${version}";
@@ -16,7 +16,8 @@ stdenv.mkDerivation {
   };
 
   inherit (sourceInfo) name version;
-  buildInputs = [ cmake libGLU libGL libX11 libXi ];
+  nativeBuildInputs = [ cmake ];
+  buildInputs = [ libGLU libGL libX11 libXi ];
 
   sourceRoot = "liquidfun/Box2D/";
 
@@ -26,10 +27,10 @@ stdenv.mkDerivation {
     sed -i Box2D/Common/b2Settings.h -e 's@b2_maxPolygonVertices .*@b2_maxPolygonVertices 15@'
     substituteInPlace Box2D/CMakeLists.txt --replace "Common/b2GrowableStack.h" "Common/b2GrowableStack.h Common/b2GrowableBuffer.h"
   '';
-      
+
   configurePhase = ''
     mkdir Build
-    cd Build; 
+    cd Build;
     cmake -DBOX2D_INSTALL=ON -DBOX2D_BUILD_SHARED=ON -DCMAKE_INSTALL_PREFIX=$out ..
   '';
 
@@ -45,4 +46,3 @@ stdenv.mkDerivation {
     homepage = "https://google.github.io/liquidfun/";
   };
 }
-