[PyQt] Slot lookup fails when inheritance depth is larger than one

[Matt Newell]

I first discovered this with comparison not working as 
expected with a wrapped type.  The __eq__ slot lookup 
was failing because sip only looks at the 
sipClassTypeDef and the direct parent.  Neither contain 
slots because they are defined in the grandparent.

Attached is a patch that implements a depth first 
recursive algorithm for slot lookup, which fixes the 
problem for me.

Matt
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