RFR: 8309216: Cast from jchar* to char* in test java/io/GetXSpace.java [v3]

[Brian Burkhalter]

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

Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:

  8309216: Move string release into common flow (win)

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Changes:
  - all: https://git.openjdk.org/jdk/pull/14276/files
  - new: https://git.openjdk.org/jdk/pull/14276/files/18506101..0ecf89b1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14276&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14276&range=01-02

  Stats: 8 lines in 1 file changed: 2 ins; 3 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/14276.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14276/head:pull/14276

PR: https://git.openjdk.org/jdk/pull/14276