gethostbyname may return any combination of IPv4 and IPv6 addresses,
and it's not safe to assume the first address is IPv4, which is all
our code is currently prepared to handle. In contrast, getaddrinfo
allows us to specify whether we want IPv4, IPv6, or both.
We should eventually make this switch on Windows as well, but the
status of getaddrinfo in Windows 2000 is not clear, and MinGW's
ws2tcpip.h only declares it for XP and above.
This commit also adds InetAddress.getByName for explicit DNS lookups.
On POSIX systems, Avian sends a special signal to a thread to
implement Thread.getStackTrace() when called from a different thread.
If the target thread is blocked on a call to accept when this happens,
it will return -1, with errno set to EINTR. Instead of treating this
as an error, we now just loop and call accept again.
and server socket channels are implemented. This version works but only when
libnative is linked with g++ (because of C++ object creation code that fails
without this linking)
