#include in IDL

[Steve Swanson]

Does anyone know how I can #include a C header file into an IDL file? 
It seems like xpidl doesn't do anything with the .h file other than pass 
it through.  Do I have to flip a build flag or change the extension of 
the input file?  I guess I could run the preprocessor myself -- does 
anyone know of an example in the Mozilla tree?

My component acts as a wrapper for some external code which happens to 
live in a DLL.  The DLL functions use special constants which are 
defined in a .h file.  The easiest (only?) way to expose the constants 
to JavaScript are by putting them in the IDL interface.

So I want to have IDL lines which look something like
    const unsigned long SeriesOrder         = EID_SERIESORDER;
where the RHS is a constant defined in the .h file.
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