Fixes for 32-bit Swift (arm)

[hpux735]

These changes are a bit ugly. The issue with INADDR_CONST is that I have to tell Swift very explicitly (this feels like a swift bug to me) the bit pattern type. The literal constant is stubbornly interpreted as a Int, which being 32-bit, would overflow (swift protects the sign bit).

The change to NetTCPSSL.swift is because the api is slightly different. So, this just traps the arm case and coerces the type.

[petershaw]

The changes in Sources/NetTCP.swift will not work on 4.1, but the changes in Sources/NetTCPSSL.swift saved my day. This should be merged. Can you please clean up the commit and so a new merge request? Than, Perfect will work on Raspi's too.