On Solaris and derivatives such as SmartOS, the length of socket options
for multicast and ttl options is not always sizeof(char).
This fixes the udp_options and udp_options6 tests.
PR-URL: https://github.com/libuv/libuv/pull/243
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>
b27a55c3cc