RFR: 8375294: (fs) Files.copy can fail with EOPNOTSUPP when copy_file_range not supported

[Brian Burkhalter]

On Wed, 14 Jan 2026 18:26:52 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

> Handle `errno` value `EOPNOTSUPP` for `copy_file_range` system call on Linux.

It does not verify this fix, but the Linux aarch64 and x64 builds succeeded and the jdk_nio tests passed on these platforms.

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PR Comment: https://git.openjdk.org/jdk/pull/29234#issuecomment-3751004623