RFR: 8366575: Remove SDP support

[Daniel Fuchs]

On Tue, 28 Oct 2025 08:40:35 GMT, Volkan Yazici <vyazici at openjdk.org> wrote:

> Remove support for [SDP] (Sockets Direct Protocol), which has been obsolete for more than a decade – see [JDK-8366575] for details. Tier1-2 is clear.
> 
> [SDP]: https://docs.oracle.com/javase/tutorial/sdp/sockets/overview.html
> [JDK-8366575]: https://bugs.openjdk.org/browse/JDK-8366575

LGTM.

The only other mention of sdp I could find in the sources and test is in [ct.properties](https://github.com/openjdk/jdk/blob/28f2591bad49c4d1590325c3d315d850ab6bcc7d/src/jdk.compiler/share/classes/com/sun/tools/javac/resources/ct.properties#L668) (javac) but since this file also contains references to corba packages that have long  been removed I expect that reference should also remain.

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PR Comment: https://git.openjdk.org/jdk/pull/28012#issuecomment-3462778460