widl: Added find_importinfo and alloc_importinfo implementation and rewrite add_dispatch on top of them.

[Jacek Caban]

This patch depends on "widl: Added an option to set importlib search path." patch (any its version).
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 tools/widl/write_msft.c |  103 ++++++++++++++++++++++++++++++++++++++---------
 1 files changed, 84 insertions(+), 19 deletions(-)

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