RFR: 8288485: [PPC64] Usage of iostream breaks NullCallerTest

[Martin Doerr]

I'd like to revert to "<stdio.h>" functions like it was before [JDK-8281001](https://bugs.openjdk.org/browse/JDK-8281001), except that I'm using stderr in order to preserve the new behavior. Also see JBS issue.

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Commit messages:
 - 8288485: [PPC64] Usage of iostream breaks NullCallerTest

Changes: https://git.openjdk.org/jdk19/pull/19/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk19&pr=19&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8288485
  Stats: 4 lines in 1 file changed: 1 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/jdk19/pull/19.diff
  Fetch: git fetch https://git.openjdk.org/jdk19 pull/19/head:pull/19

PR: https://git.openjdk.org/jdk19/pull/19