pidl/lib: Add recursion detection logic to prevent looping.

pidl/lib: Add recursion detection logic to prevent looping.

Under some circumstances 'can_contain_deferred' & 'align_type functions' can
loop.

This prevents a hang when processing sample idl like

interface hang
{
	typedef [public] struct {
		wsp_cbasestoragevariant variant[NUM_ENTRIES];
	} vt_variant_wrap;

	typedef [public,nodiscriminant,switch_type(uint16)] union {
		[case(VT_I1)] int8 vt_i1;
		[case(VT_VARIANT)] vt_variant_wrap vt_variant_wrap;
	} variant_types;

	typedef [public] struct {
		[switch_is(vtype)] variant_types vvalue;
	} wsp_cbasestoragevariant;
};

which will hang with the following command

   pidl --header --ndr-parser -- foo.idl

Signed-off-by: Noel Power <noel.power@suse.com>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>