only try to link driver source files locally when not building in the source tree, and only remove on make clean them in this case
only try to link driver source files locally when not building in the source tree, and only remove on make clean them in this case

git-svn-id: 29c1264a5cf5e3532df57b06678e7347571c1a3c@480 f1ba3bf5-cb5c-402b-92a9-7c6bdc83a356

ananos/xen2mx,ananos/xen2mx,ananos/open-mx,ananos/xen2mx,ananos/open-mx,ananos/xen2mx,ananos/open-mx