Build dirs need to exists before we can do much of our work. Before we "solved" this with
a bunch of mkdir calls. @filberg pointed out that we can do order only pre-reqs, so this
commit implements them across the codebase
This uncovered a second issue; when we pull down the kernel sources they keep the timestamp
from the server. Added --no-use-server-timestamps to stop this from causing useless rebuilds.
finally this commit pulls the downloaded kernel sources out of the tree and into their proper
spot in the build dir
Austin English
SolidHal