(demangle.o): New target.
(cplus-dem.o): Depend on it, to force compilation order when doing
parallel compiles.
* nm.c (print_symbol_info_{bsd,sysv,posix}): Take a bfd arg.
(struct output_fns print_symbol_info): Ditto.
(long_options, usage, main): Add -C --demangle option.
(print_symname): New function, demangling if requested.
(print_symbols, print_symbol_info_{bsd,sysv,posix}): Use it.
(cplus-dem.o): Link c++filt with version.o.
* strings.c: Include bucomm.h and add prototypes to other decls.
Remove -h option.
* bucomm.h: Declare xrealloc.
* nm.c, objcopy.c, objdump.c, size.c, strings.c (main, usage): Add
--help option. Put "GNU" in the version message.
(usage): Take stream and exit status as args.
(main): Pass new args to usage.
