RFR: 8309216: Cast from jchar* to char* in test java/io/GetXSpace.java

[Brian Burkhalter]

On Fri, 2 Jun 2023 00:00:07 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

> For Unix, copy the `jchar`s into an allocated `char` array.

Preliminary test run passes.

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PR Comment: https://git.openjdk.org/jdk/pull/14276#issuecomment-1572936688