widl: Fix pointer detection in structures and arrays. [try 2]

[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 |   42 +++++++++++++++++++++++++++++++++++++++++-
   1 files changed, 41 insertions(+), 1 deletions(-)


This version fixes a crash with unions with empty case statements.
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