[MERGE][trivial] builtins._create_prefix use 'location', give it a parameter, thank you

[Martin Pool]

Martin Pool has voted -1.
Status is now: Vetoed
Comment:
I agree, just transport.base would be a simpler fix


For details, see: 
http://bundlebuggy.aaronbentley.com/request/%3Cm2y7iesnfx.fsf%40free.fr%3E