New UNUSED(param) macro suppresses the warning for a specific parameter
In some cases, removed the unused parameters. In others, used the
parameter in a DEBUGF() or assert() statement to document the intent.
Add struct sockaddr_in 'inet' union field, rename 'addr_un' union field
to 'local'
Replace recvwithttl()'s (struct sockaddr *) and socklen_t pair of args
with single (struct socket_address *) arg
