It behaves as `uv_signal_start` but it resets the signal handler as soon
as the signal is received.
Fixes: https://github.com/libuv/libuv/issues/1104
PR-URL: https://github.com/libuv/libuv/pull/1106
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>
Reviewed-By: Bartosz Sosnowski <bartosz@janeasystems.com>