* ld.texinfo (Options): Document new option, -nostdlib.
* lexsup.c (OPTION_NOSTDLIB): New definition.
(ld_options): Add entry for "nostdlib".
(parse_args): Handle OPTIONS_NOSTDLIB.
* ldfile.c (ldfile_add_library_path): Don't add directories
to the search path if they weren't specified on the command line
and -nostdlib was specified.
* ld.h (ld_config_type): New member only_cmd_line_lib_dirs.