Changeset b8b0f44 in rtems-source-builder for source-builder/config/dtc-1-1.cfg

config: Use ${build_top} to change dir to parent.

On NetBSD with ksh changing into a symlink made PWD the link's
target path so a 'cd ..' returned you to that parent and not
the parent you started from. Record the build top and then
change back to that path.

Change the package names to the actual packages and remove the
extra directory in the build tree. This makes the paths simpler.