This driver should be compiled in kernel it self or it is completaly
broken. Either way just drop it.

Master id deployed to dragons and there will be no point of deploying it
to sloths. It is question how to make this change more general across
forks and merges but let's ignore that for now.

Previous implementation was just wrong lets face it.

This reverts commit 4ac86b03.

This is better idea as having #!/bin/bash -e is fragile. Anyone can run
this script with bash -x file and that way unintentionally disable -e
flag.

On server is currently used invalid configuration. This commit can be
reverted after merge to master and configuration file update.

Until now it was called somewhat not systematically before every build
and after OpenWRT patching.

This is code that was originally only in Jenkins but it makes sense to
have this prepare stage externally documented and git tracked so I moved
it here.

Empty make argument causes make to build default target. This commit
removes any empty arguments from make calls.

Build is not split to multiple steps and having one central statistics
does not make sense. Also this stat is tracked by external build system
tool (Jenkins).

This also introduces new argument: -jNUM
This is more comfortable way to specify number of parallel jobs.