Following patch adds a new mk variable MKDTRACETOOLKIT & Makefile to src/external/cddl/dtracetoolkit to install dtruss, execsnoop, opensnoop & procsystime. http://www.netbsd.org/~sevan/patch-mkdtracetoolkit-mk2.txt
Release build tested for amd64 & evbarm (ports with DTrace support) and sparc64 (port without DTrace support). Sevan
