waf/python build/check mixup

[Hal Murray]

esr at thyrsus.com said:
> No, that's not it.  I know how the waf build logic works, I've had to modify
> it quite often.  I know you think you've found a bug there, but I think
> you're misinterpreting something.  I'll figure it out. 

I think the test case that started this thread indicates that something is 
screwed up.  That something might be my understanding, but that's a pretty 
simple example.

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