netbsd: use uv__cloexec and uv__nonblock

This commit causes NetBSD, like other BSDs, to reuse
uv__cloexec_ioctl and uv__nonblock_ioctl. This fixes
poll_nested_kqueue.

PR-URL: https://github.com/libuv/libuv/pull/1575
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>

src/unix/internal.h

@@ -175,7 +175,8 @@ struct uv__stream_queued_fds_s {
     defined(__FreeBSD__) || \
     defined(__FreeBSD_kernel__) || \
     defined(__linux__) || \
-    defined(__OpenBSD__)
+    defined(__OpenBSD__) || \
+    defined(__NetBSD__)
 #define uv__cloexec uv__cloexec_ioctl
 #define uv__nonblock uv__nonblock_ioctl
 #else