(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.
