RFR: 8297778: Modernize and improve module jdk.sctp

[Alan Bateman]

On Tue, 29 Nov 2022 19:24:14 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

> There could be more sharing of the unsupported implementation if SctpChannel was not abstract and its method bodies threw the exception. There would less duplication for unsupported platforms.

I think this is accident of history. As I recall, the "unsupported implementation" was Windows only in JDK 6 but it has since been copied. It could be cleaned up.

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PR: https://git.openjdk.org/jdk/pull/11418