This fixes the build at least on FreeBSD, where those types were not
defined indirectly:
src/openssl_stream.c💯18: error: variable has incomplete type 'struct in6_addr'
struct in6_addr addr6;
^
src/openssl_stream.c💯9: note: forward declaration of 'struct in6_addr'
struct in6_addr addr6;
^
src/openssl_stream.c:111:18: error: use of undeclared identifier 'AF_INET'
if (p_inet_pton(AF_INET, host, &addr4)) {
^
src/unix/posix.h:31:40: note: expanded from macro 'p_inet_pton'
^
src/openssl_stream.c:115:18: error: use of undeclared identifier 'AF_INET6'
if(p_inet_pton(AF_INET6, host, &addr6)) {
^
src/unix/posix.h:31:40: note: expanded from macro 'p_inet_pton'
^
Most of the network-facing facilities have been copied to the socket and
openssl streams. No code now uses these functions directly anymore, so
we can now remove them.
This unfortunately isn't as stackable as could be possible, as it
hard-codes the socket stream. This is because the method of using a
custom openssl BIO is not clear, and we do not need this for now. We can
still bring this in if and as we need it.
