Changeset 2074bd1 in rtems-source-builder for rtems/config/tools

rtems-tools: Start a build with a distclean to clean away an old build.

If building rtems-tools from git and switching the RSB branch the
git repo for rtems-tools holds object files from the old branch. This
is due to waf building in the source tree and the RSB keepiing the
git repo around in the sources directory.