New packages: pam_mount and libHX

Add pam_mount package. Integration into NixOS is still missing.

pkgs/development/libraries/libHX/default.nix

@@ -0,0 +1,29 @@
+{ stdenv, fetchurl, autoconf, automake, libtool }:
+
+stdenv.mkDerivation rec {
+  name = "libHX-3.21";
+
+  src = fetchurl {
+    url = "mirror://sourceforge/libhx/libHX/3.21/${name}.tar.xz";
+    sha256 = "0wcr6kbhsw6v4js7q4p7fhli37c39dv1rryjf768rkwshl2z8f6v";
+  };
+
+  patches = [];
+
+  buildInputs = [ autoconf automake libtool ];
+
+  preConfigure = ''
+    sh autogen.sh
+    '';
+
+  meta = {
+    homepage = http://libhx.sourceforge.net/;
+    description = ''
+      libHX is a C library (with some C++ bindings available) that provides data structures
+      and functions commonly needed, such as maps, deques, linked lists, string formatting
+      and autoresizing, option and config file parsing, type checking casts and more.
+      '';
+    maintainers = [];
+    platforms = stdenv.lib.platforms.linux;
+  };
+}