junixsocket 2.9.0

• Add generic socket fallback for FileDescriptors received from other processes
• Add "dup"/"dup2" support via FileDescriptorCast.duplicating
• Add listen/accept support to AFDatagramSocket, so we can serve SEQPACKETs
• Add more SocketException subclasses (such as BrokenPipe-/ConnectionResetSocketException)
• Add support to make shutdown-upon-close configurable
• Add support for undocumented "ECLOSED" (errno 3417) condition on IBM i PASE
• Add test for the "close-during-accept" condition
• Fix native library loading for AIX/IBM i on Java 15 and newer
• Fix blocking state when using FileDescriptorCast
• Fix module-info.java: Don't mark requirements transient (annotations, mysql connector)
• Fix TIPC tests on some old environments (which didn't time out)
• Fix compilation for z/OS 32-bit
• Fix AFServerSocketChannel.getLocalAddress to return AFSocketAddress subclass
• Fix unnecessary failures in some tests, error handling in selftest
• Fix "force override" path parsing for native library on Windows
• Update build/plugin/test/demo dependencies
• Update crossclang scripts; no longer requires root to install Xcode components
• Improve error handling on broken Java VMs (e.g., IBM Semeru 8.0.7 and older)
• Improve demo code, use slf4j-simple for logging
• Code cleanup

Backwards-incompatible change: Some AFSocket classes are now final or no longer declare constructor exceptions.