widl: Parse typedefs of function pointers.

[Robert Shearman]

---
  tools/widl/parser.y    |   40 ++++++++++++++++++----------------------
  tools/widl/widltypes.h |    2 ++
  2 files changed, 20 insertions(+), 22 deletions(-)

This patch doesn't update the header writing code to actually print 
typedefs of function pointers out, but it allows widl to parse them 
without error now.
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