swig: use pname and standardize meta

- pname makes it easier to override the version in an overlay and looks generally cleaner
- Updated the meta sections to match between the various versions

No real functional change, just cleanup.

pkgs/development/tools/misc/swig/default.nix

@@ -1,10 +1,11 @@
 { stdenv, fetchurl, boost, tcl }:
 
 stdenv.mkDerivation rec {
-  name = "swig-1.3.40";
+  pname = "swig";
+  version = "1.3.40";
 
   src = fetchurl {
-    url = "mirror://sourceforge/swig/${name}.tar.gz";
+    url = "mirror://sourceforge/swig/${pname}-${version}.tar.gz";
     sha256 = "02dc8g8wy75nd2is1974rl24c6mdl0ai1vszs1xpg9nd7dlv6i8r";
   };
 
@@ -14,26 +15,12 @@ stdenv.mkDerivation rec {
 
   configureFlags = [ "--disable-ccache" ];
 
-  meta = {
-    description = "Interface compiler that connects C/C++ code to higher-level languages";
-
-    longDescription = ''
-       SWIG is an interface compiler that connects programs written in C and
-       C++ with languages such as Perl, Python, Ruby, Scheme, and Tcl.  It
-       works by taking the declarations found in C/C++ header files and using
-       them to generate the wrapper code that scripting languages need to
-       access the underlying C/C++ code.  In addition, SWIG provides a variety
-       of customization features that let you tailor the wrapping process to
-       suit your application.
-    '';
 
+  meta = with stdenv.lib; {
+    description = "SWIG, an interface compiler that connects C/C++ code to higher-level languages";
     homepage = http://swig.org/;
-
-    # Licensing is a mess: http://www.swig.org/Release/LICENSE .
-    license = "BSD-style";
-
-    platforms = stdenv.lib.platforms.all;
-
-    maintainers = [ ];
+    # Different types of licenses available: http://www.swig.org/Release/LICENSE .
+    license = licenses.gpl3Plus;
+    platforms = with platforms; linux ++ darwin;
   };
 }