git: openjdk/jdk-sandbox: fibers-iouring: Use register_eventfd

[duke]

Changeset: 57f51291
Branch: fibers-iouring
Author:    Alan Bateman <alan.bateman at oracle.com>
Date:      2025-08-07 16:19:48 +0000
URL:       https://git.openjdk.org/jdk-sandbox/commit/57f512918709c19efa0109d8489ef603a860d390

Use register_eventfd

! src/java.base/linux/classes/sun/nio/ch/IoUringPoller.java