RFR: CODETOOLS-7902954: jcstress: Move unpacked JNA library to proper name

[Aleksey Shipilev]

This is a regression from CODETOOLS-7902951. We need to move the unpacked library to the proper name, so that forked VM loader would discover it properly.

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Commit messages:
 - CODETOOLS-7902954: jcstress: Move unpacked JNA library to proper name

Changes: https://git.openjdk.java.net/jcstress/pull/62/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jcstress&pr=62&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7902954
  Stats: 50 lines in 3 files changed: 47 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jcstress/pull/62.diff
  Fetch: git fetch https://git.openjdk.java.net/jcstress pull/62/head:pull/62

PR: https://git.openjdk.java.net/jcstress/pull/62