maildrop: add version 2.6.0

pkgs/tools/networking/maildrop/default.nix

···
+{ fetchurl, stdenv, pkgconfig, pcre, perl }:
+
+stdenv.mkDerivation rec {
+  name = "maildrop-2.6.0";
+
+  src = fetchurl {
+    url = "mirror://sourceforge/courier/maildrop/2.6.0/maildrop-2.6.0.tar.bz2";
+    sha256 = "1a94p2b41iy334cwfwmzi19557dn5j61abh0cp2rfc9dkc8ibhdg";
+  };
+
+  buildInputs = [ pkgconfig pcre perl ];
+
+  patches = [ ./maildrop.configure.hack.patch ]; # for building in chroot
+
+  meta = {
+    homepage = http://www.courier-mta.org/maildrop/;
+    description = "Mail filter/mail delivery agent that is used by the Courier Mail Server";
+    licenses = [ "GPLv3" ];
+  };
+}

pkgs/tools/networking/maildrop/maildrop.configure.hack.patch

···
+--- a/maildrop/configure	2012-09-06 01:52:13.000000000 +0100
++++ b/maildrop/configure	2013-01-04 03:00:57.095628327 +0000
+@@ -17562,8 +17562,8 @@
+ check_spooldir() {
+   if test "$CHECKED_SPOOLDIR" != 1
+   then
+-     get_spooldir
+-     MBOX_DIR="$SPOOLDIR"
++     MBOX_DIR="/var/spool/mail"
++     MBOX_RESET_GID=0
+      CHECKED_SPOOLDIR=1
+   fi
+ }

pkgs/top-level/all-packages.nix

···
 
   lzop = callPackage ../tools/compression/lzop { };
 
+  maildrop = callPackage ../tools/networking/maildrop { };
+
   mailutils = callPackage ../tools/networking/mailutils {
     guile = guile_1_8;
   };