all: detect --help and --version more consistently

all: detect --help and --version more consistently

For select programs which accept only --help and --version options
(in addition to non-option arguments), process these options before
any other options.

Before:

  $ dd bs=1 --help
  dd: unrecognized option '--help'
  Try 'dd --help' for more information.

  $ yes me --help
  me --help
  me --help
  ...

After:
Any occurrence of '--help' in the arguments (prior to '--') will
show the help screen.

Discussed in https://bugs.gnu.org/33468 .

* NEWS: Mention change.
* src/cksum.c, src/dd.c, src/hostid.c, src/hostname.c, src/link.c,
src/logname.c, src/nohup.c, src/sleep.c, src/tsort.c, src/unlink.c,
src/uptime.c, src/users.c, src/whoami.c, src/yes.c (main): Replace
parse_long_options() + getopt_long() calls with
parse_gnu_standard_options_only(); Remove <getopt.h> inclusion;
Remove empty 'struct long_options' variable;
* tests/misc/help-version-getopt.sh: Add test.
* tests/local.mk (all_tests): Reference it.