`thread_sched_wait_events()` suspend the thread until the target
fd is ready. Howver, other threads can close the target fd and
suspended thread should be awake. To support it, setup `waiting_fd`
before `thread_sched_wait_events()`.

`rb_thread_io_wake_pending_closer()` should be called before
`RUBY_VM_CHECK_INTS_BLOCKING()` because it can return this function.

This patch introduces additional overhead (setup/cleanup `waiting_fd`)
and maybe we can reduce the overhead.

use `rb_thread_io_blocking_call()` instead of
`rb_thread_io_blocking_region()` more.

See ruby#9178 (comment)