widl: Fix pointer detection in structures and arrays.

[Robert Shearman]

write_embedded_types doesn't descend into all types contained by the 
array or structure, so create a new function, type_has_pointers, for the 
purpose of descending into all types and returning whether or not 
pointers are present.
---
  tools/widl/typegen.c |   34 +++++++++++++++++++++++++++++++++-
  1 files changed, 33 insertions(+), 1 deletions(-)
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