RFR: 8288687: (fc) Unix version ofFileChannelImpl.transferTo0() should should return IOS_UNSUPPORTED if not Linux, macOS, nor AIX

[kristylee88]

On Fri, 17 Jun 2022 16:26:39 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

> Return `IOS_UNSUPPORTED` from the `#else` conditional compilation branch of `Java_sun_nio_ch_FileChannelImpl_transferTo0`.

Marked as reviewed by kristylee88 at github.com (no known OpenJDK username).

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PR: https://git.openjdk.org/jdk/pull/9205