audit: Move z/OS plugin to a separate output

This prevents the NixOS base system from pulling in openldap,
cyris-sasl, and libkrb5.

pkgs/os-specific/linux/audit/default.nix

@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
     sha256 = "0jwrww1vn7yqxmb84n6y4p58z34gga0ic4rs2msvpzc2x1hxrn31";
   };
 
-  outputs = [ "bin" "dev" "out" "man" ];
+  outputs = [ "bin" "dev" "out" "man" "plugins" ];
 
   buildInputs = [ openldap ]
             ++ stdenv.lib.optional enablePython python;
@@ -21,6 +21,16 @@ stdenv.mkDerivation rec {
     ${if enablePython then "--with-python" else "--without-python"}
   '';
 
+  enableParallelBuilding = true;
+
+  postInstall =
+    ''
+      # Move the z/OS plugin to a separate output to prevent an
+      # openldap runtime dependency in audit.bin.
+      mkdir -p $plugins/bin
+      mv $bin/sbin/audispd-zos-remote $plugins/bin/
+    '';
+
   meta = {
     description = "Audit Library";
     homepage = "http://people.redhat.com/sgrubb/audit/";