Handle the case when the DATA_TYPE is not a simple type

Pick up change from Samba:

    commit 343db5326b369cbdef4b723e3056acc2a866a887
    Author: Matthieu Patou <mat@matws.net>
    Date:   Tue Sep 23 01:28:40 2014 -0700

    pidl-wireshark: Handle the case when the DATA_TYPE is not a simple type

    Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>

Change-Id: I511a60beb392e5e92701d5ace1260397fb4be851
Reviewed-on: https://code.wireshark.org/review/5092
Reviewed-by: Guy Harris <guy@alum.mit.edu>