libcody: Do not use a dummy port number in getaddrinfo().

libcody: Do not use a dummy port number in getaddrinfo().

the getaddrinfo() requires either a non-null name for the server or
a port service / number.  In the code that opens a connection we have
been calling this with a dummy port number of "0".  Unfortunately this
triggers a bug in some BSD versions and OSes importing that code.

In this part of the code we do not really need a port number, since it
is not reasonable to open a connection to an unspecified host.

Setting hints info field to 0, and the servname parm to nullptr works
around the BSD bug in this case.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
libcody/ChangeLog:

	* netclient.cc (OpenInet6): Do not provide a dummy port number
	in the getaddrinfo() call.