libsexy: remove

People have only been using this for the spell-entry widget, i.e even
hexchat just has the code vendored and are maintaining it themselves.

There is a continuation that could be packaged if anyone needs it
* https://github.com/TingPing/libsexy3
but currently no package within nixpkgs has a use for this.

pkgs/development/python-modules/libsexy/default.nix

@@ -1,27 +0,0 @@
-{ stdenv, fetchurl, buildPythonPackage, libsexy, pkgconfig, libxml2, pygtk, pango, glib, python }:
-
-buildPythonPackage rec {
-  pname = "libsexy";
-  version = "0.1.9";
-  format = "other";
-
-  src = fetchurl {
-    url = "http://releases.chipx86.com/libsexy/sexy-python/sexy-python-${version}.tar.gz";
-    sha256 = "05bgcsxwkp63rlr8wg6znd46cfbhrzc5wh70jabsi654pxxjb39d";
-  };
-
-  nativeBuildInputs = [ pkgconfig pygtk ];
-
-  propagatedBuildInputs = [
-    pygtk libsexy glib pango libxml2
-  ];
-
-  postInstall = ''
-    ln -s $out/${python.sitePackages}/gtk-2.0/* $out/${python.sitePackages}
-  '';
-
-  meta = {
-    description = "Python libsexy bindings";
-    platforms = stdenv.lib.platforms.linux;
-  };
-}