Make tests work again on alpha-osf1 and sun4 native.

Make tests work again on alpha-osf1 and sun4 native.

	* config/unix.exp: Use nm.new, not nm, from newly built tree.

	* binutils.all/objdump.exp: Add more wildcards to list of
	single-letter options in pattern for usage message.

	* binutils.all/nm.exp: Deleted debug-symbols test, since it only
	works for a.out/stabs systems.  Fixed regexps to make underscores
	optional, since some C compilers don't prepend them.  Deleted
	check for foo.o symbol, since again some systems don't generate
	it.