pidl: Allow the compilation of the ndr_table to be skiped

pidl: Allow the compilation of the ndr_table to be skiped

libnetapi.idl defines a large number of functions a nopull,nopush and
no replacement is provided.

This will allow the ndr_table to be generated for all other IDL files
that may have public structures that could usefully be dumped by
ndrdump.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14191

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Pair-progammed-with: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>