RFR: 8292562: (fc) Use copy_file_range in FileChannel::transferTo on Linux [v7]

[Brian Burkhalter]

On Thu, 25 Aug 2022 02:56:01 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>> Add `copy_file_range(2)` to the native Linux implementation of `FileChannel::transferTo`.
>
> Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8292562: Fix test on macOS and Windows

> [M]aybe the simplest thing for now is to revert the test back to testing transferTo when the target is opened for append.

So changed in 6351c8d26b30cd92b6d4a1facbc25fb304d28bc0 and limited to run on Linux only.

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PR: https://git.openjdk.org/jdk/pull/9925