Update for Socket API Helper

@eskimo:

Your helpful code of Socket API Helper does not compile on Swift 5 any more.

Reasons:

1: Cannot convert value of type 'UnsafePointer' to expected argument type 'UnsafeMutablePointer'

2: Cannot pass immutable value as inout argument: 'pointee' is a get-only property

And update would be super helpful and make my day.

Thx!

PS: I was forced to choose at least one tag and could not find a suitable one. Thus Xcode. Sorry.

Update for Socket API Helper
 
 
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