strip program (via "install") to strip itself. But the program
wasn't executable because "install" hadn't made it so yet. I
borrowed the method used for the old strip to get around this.
This finishes up the binutils import. But I am leaving it disabled
in "src/gnu/usr.bin/Makefile" for now. It is not used by anything
yet, so I'll take this opportunity to run one more round of tests
before enabling it.