pax-utils: meta cleanups

- Description from upstream
- A more informative homepage
- Per upstream, pax-utils should work for unix-likes beyond linux

pkgs/os-specific/linux/pax-utils/default.nix

@@ -1,4 +1,4 @@
-{ fetchurl, stdenv }:
+{ stdenv, fetchurl }:
 
 stdenv.mkDerivation rec {
   name = "pax-utils-${version}";
@@ -9,15 +9,19 @@ stdenv.mkDerivation rec {
     sha512 = "26f7lqr1s2iywj8qfbf24sm18bl6f7cwsf77nxwwvgij1z88gvh6yx3gp65zap92l0xjdp8kwq9y96xld39p86zd9dmkm447czykbvb";
   };
 
-  makeFlags = [
-    "PREFIX=$(out)"
-  ];
+  makeFlags = [ "PREFIX=$(out)" ];
 
   meta = with stdenv.lib; {
-    description = "A suite of tools for PaX/grsecurity";
-    homepage    = "https://dev.gentoo.org/~vapier/dist/";
+    description = "ELF utils that can check files for security relevant properties";
+    longDescription = ''
+      A suite of ELF tools to aid auditing systems. Contains
+      various ELF related utils for ELF32, ELF64 binaries useful
+      for displaying PaX and security info on a large groups of
+      binary files.
+    '';
+    homepage = https://wiki.gentoo.org/wiki/Hardened/PaX_Utilities;
     license = licenses.gpl2;
-    platforms   = platforms.linux;
+    platforms = platforms.unix;
     maintainers = with maintainers; [ thoughtpolice joachifm ];
   };
 }