* include/ruby/win32.h (rb_w32_aspawn_flags): add the declaration of

  new function.

* process.c (enum): add EXEC_OPTION_PGROUP and move the position
  above for the usage in proc_spawn_n().

* process.c (proc_spawn_n): add an argument to pass new option
  `new_pgroup`. The option specifies CREATE_NEW_PROCESS_GROUP flag to
  CreateProcessW(). This flag is necessary for the usage of
  Process.kill on the subprocess on Windows.

* process.c (rb_exec_arg_addopt): ditto.

* process.c (rb_spawn_process): ditto.

* process.c (documentation for rb_f_spawn): add documentation for new
  option `new_pgroup` of spawn.

* test/ruby/test_process.rb (TestProcess#test_execopts_new_pgroup):
  add tests for option `new_pgroup`.

* test/ruby/test_thread.rb
  (TestThreadGroup#test_thread_timer_and_interrupt):
  add option `new_pgroup: true` to spawn on Windows. It's needed for
  Process.kill on a subprocess.

* win32/win32.c (CreateChild): add an argument to pass
  dwCreationFlags of CreateProcessW().

* win32/win32.c (rb_w32_spawn): ditto.

* win32/win32.c (rb_w32_aspawn_flags): add new function to pass
  dwCreationFlags.

* win32/win32.c (rb_w32_aspawn): refactor to move the content to
  rb_w32_aspawn_flags().
  [ruby-core:43245][Bug #6131]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@35250 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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