Xaw3d: add license, move build tools nativeBuildInputs

pkgs/development/libraries/Xaw3d/default.nix

···
-{stdenv, fetchurl, xlibsWrapper, imake, gccmakedep, libXmu, libXpm, libXp, bison, flex, pkgconfig}:
+{ stdenv, fetchurl
+, imake, gccmakedep, bison, flex, pkgconfig
+, xlibsWrapper, libXmu, libXpm, libXp }:
 
 stdenv.mkDerivation {
   name = "Xaw3d-1.6.3";
···
     url = https://www.x.org/releases/individual/lib/libXaw3d-1.6.3.tar.bz2;
     sha256 = "0i653s8g25cc0mimkwid9366bqkbyhdyjhckx7bw77j20hzrkfid";
   };
-  nativeBuildInputs = [ pkgconfig ];
-  buildInputs = [imake gccmakedep libXpm libXp bison flex];
-  propagatedBuildInputs = [xlibsWrapper libXmu];
+  nativeBuildInputs = [ pkgconfig bison flex imake gccmakedep ];
+  buildInputs = [ libXpm libXp ];
+  propagatedBuildInputs = [ xlibsWrapper libXmu ];
 
-  meta = {
+  meta = with stdenv.lib; {
     description = "3D widget set based on the Athena Widget set";
     platforms = stdenv.lib.platforms.unix;
+    license = licenses.mit;
   };
 }