[WIDL] Eliminate redundant callback routines

[Robert Shearman]

ChangeLog:
Add a function for comparing expressions and use it to eliminate
redundant callback functions.

  tools/widl/typegen.c |   83 
+++++++++++++++++++++++++++++++++++++++++++-------
  1 files changed, 71 insertions(+), 12 deletions(-)

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