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/3.x.nix

@@ -1,7 +1,7 @@
 { stdenv, fetchFromGitHub, autoconf, automake, libtool, bison, pcre, buildPackages }:
 
 stdenv.mkDerivation rec {
-  name = "swig-${version}";
+  pname = "swig";
   version = "3.0.12";
 
   src = fetchFromGitHub {
@@ -17,8 +17,8 @@ stdenv.mkDerivation rec {
 
   configureFlags = [ "--without-tcl" ];
 
+  # Disable ccache documentation as it needs yodl
   postPatch = ''
-    # Disable ccache documentation as it need yodl
     sed -i '/man1/d' CCache/Makefile.in
   '';