pidl: get the pointer types correct when an element has multiple pointers

pidl: get the pointer types correct when an element has multiple pointers

Only the first level gets the pointer type from the
pointer property, the others get them from
the pointer_default() interface property

see http://msdn2.microsoft.com/en-us/library/aa378984(VS.85).aspx
(Here they talk about the rightmost pointer, but testing shows
they mean the leftmost pointer.)

metze
(This used to be commit aa8518521b2a6a7110c84c4981c53acce7389ee9)