Comment # 10 on bug 782060 from Reinhard Max

I'll change this patch to use

hints.ai_socktype = SOCK_DGRAM;

as suggested in comment 2, because we're resolving for a UDP socket here, so we
should specify that in the query.

Setting the 2nd argument of getaddrinfo() to NULL asks for an arbitrary port
rather than the port for NTP (123), and I wonder why this change hasn't broken
anything (or it has and we just didn't notice).

BTW, if reading /etc/services once is still too much, we can additionally
change "ntp" to "123" and set the AI_NUMERICSRV flag, to disable name
resolution on the service argument entirely, as it is already being done for
the node argument.