fix accidental deprecation (#1470)
fix accidental deprecation (#1470)

Motivation:

In one of the previous patches, we accidentally merged the deprecation
of `ChannelOptions.Types.SocketOption.init` which will break a lot of
NIO programs.

Modifications:

Undo the deprecation.

Result:

NIOTS builds without warnings.
apple/swift-nio,apple/swift-nio,apple/swift-nio,apple/swift-nio,apple/swift-nio