Comment # 19 on bug 1207520 from Callum Farmer

Right, everyone is just not getting it, we need to stop doing small fixes to
POBSI because it so badly designed it will keep breaking. This fixes all the
issues with generators, it works and is understandable, please stop trying to
invent small but bad solutions.

This fixes all issues with POBSI and dep generators so far including the
original virtualbox issue. 

Forcing dep generator outcomes to spec (orig solution) results in a different
key in the rpm which breaks reproducibility. 

Defining find_XX in spec shouldn't be done as this will eventually be removed
as it effectively stops modern RPM functionality.

My solution is therefore better than any suggested solution by anyone else so
far. 

If you have a solution that doesn't f*** RPM, please go ahead.