widl: Add support for complex arrays.

[Robert Shearman]

---
  tools/widl/typegen.c |   17 ++++++++++-------
  1 files changed, 10 insertions(+), 7 deletions(-)

After this patch, a complex array such as this works:
     typedef struct
     {
                     GUID        object;
...
         [string]    char        annotation[ept_max_annotation_size];
     } ept_entry_t, *ept_entry_p_t;

...
         [in, size_is(num_ents)]
                 ept_entry_t         entries[],
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