widl: let widl understand typedef enum

[Mike Hearn]

On Sat, 05 Feb 2005 12:37:08 -0600, Rob Shearman wrote:
> Yeah, it seems strange, but I have a test program here that shows it is 
> 32-bits application-side for proxies/stubs.

There's all kinds of brokenness going on in their variant marshalling, eg
some types are mapped seemingly at random to others. I have a list with
some of the details around here somewhere, but I'd totally believe
whatever Rob says on this no matter how weird.