[PATCH] Postinstall script ordering in setup - take 3

[Robert Collins]

Robert Collins wrote:
> And for clarity: my suggested tweak is also not sufficient to provide a
> weak ordering.

And another thing to be clear on: a weak ordering is required for 
correct STL behaviour, and without that, the dependencies logic is 
borken and not ready for merging. (irrespective of short/long term 
solution etc etc)

Rob