[PATCH 1/3] widl: Add support for vararg attribute.

[Misha Koshelev]

Tried to run SDK MSI OLE automation VBScript samples, noticed that usage information did not show
because WScript.Echo is a vararg method (variable number of arguments).

These patches (i) implement vararg in widl, (ii) add a conformance test for IDispatch::Invoke of vararg 
methods, and (iii) add support for vararg functions (cParamsOpt < 0) in ITypeInfo::Invoke.

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 tools/widl/write_msft.c |   13 +++++++++++--
 1 files changed, 11 insertions(+), 2 deletions(-)
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