RFR: 8340596: Remove dead code from RequiresSetenv function in java.base/unix/native/libjli/java_md.c

[Jaikiran Pai]

Can I please get a review of this trivial change which removes dead code from the `RequiresSetenv()` function?

As noted in https://bugs.openjdk.org/browse/JDK-8340596 this appears to be a left-over from the changes in https://bugs.openjdk.org/browse/JDK-8244224.

No new tests have been added and existing tier1, tier2 and tier3 tests continue to pass.

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Commit messages:
 - 8340596: Remove dead code from RequiresSetenv function in java.base/unix/native/libjli/java_md.c

Changes: https://git.openjdk.org/jdk/pull/21125/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21125&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340596
  Stats: 5 lines in 1 file changed: 0 ins; 4 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/21125.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21125/head:pull/21125

PR: https://git.openjdk.org/jdk/pull/21125