Foundation: expand out `inet_pton`
Foundation: expand out `inet_pton`

Rather than use `inet_pton` which cannot be used inline to initialise
the SOCKADDR, initialise the octets manually.  This should correct the
type constructor.

apple/swift-corelibs-foundation,e78l/swift-corelibs-foundation,e78l/swift-corelibs-foundation,apple/swift-corelibs-foundation,e78l/swift-corelibs-foundation,e78l/swift-corelibs-foundation,apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,e78l/swift-corelibs-foundation