Fix Fiber with Thread issue on Windows [Bug #14642]

* cont.c (rb_threadptr_root_fiber_setup): divide into two functions:
  * rb_threadptr_root_fiber_setup_by_parent(): called by the parent thread.
  * rb_threadptr_root_fiber_setup_by_child(): called by the created thread.

  `rb_threadptr_root_fiber_setup()` is called by the parent thread and
  set fib->fib_handle by ConvertThreadToFiber() on the parent thread on
  Windows enveironment.
  This means that root_fib->fib_handle of child thread is initialized
  with parent thread's Fiber handle. Furthermore, second call of
  `ConvertThreadToFiber()` for the same thread fails.

  This patch solves this weird situateion. However, maybe we can make more
  clean code.

* thread.c (thread_start_func_2): call
  `rb_threadptr_root_fiber_setup_by_child()` at thread initialize routine.

* vm.c (th_init): call `rb_threadptr_root_fiber_setup_by_parent()`.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63073 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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