[ruby/io-nonblock] Rename io_nonblock_mode and extract set_fcntl_flags
io_nonblock_mode
set_fcntl_flags
https://github.com/ruby/io-nonblock/commit/22f08574df
[ruby/io-nonblock] Rename
io_nonblock_mode
and extractset_fcntl_flags
https://github.com/ruby/io-nonblock/commit/22f08574df