* Re-fix issue #19284: Don't generate the no-op -R command line

  parameter to "enable" the always on sys.flags.hash_randomization
  in _args_from_interpreter_flags() used by multiprocessing and
  some unittests.  This simplifies the code.
* assert_python_ok docstring typo fix.
* Fix test_cmd_line not to fail if PYTHONHASHSEED is set to a fixed seed.

diff --cc Lib/subprocess.py
Simple merge

diff --cc Lib/test/support/script_helper.py
Simple merge

diff --cc Lib/test/test_cmd_line.py
Simple merge