uv__nonblock_fcntl() and uv__nonblock_ioctl() do not commute when
O_NDELAY is not equal to O_NONBLOCK. Case in point: linux/sparc32
and linux/sparc64, where O_NDELAY is O_NONBLOCK + another bit.
Libuv uses uv__nonblock_fcntl() directly sometimes so ensure that it
commutes with uv__nonblock().
Fixes: https://github.com/libuv/libuv/issues/1830
PR-URL: https://github.com/libuv/libuv/pull/1832
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
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