[jdk21u-dev] RFR: 8313670: Simplify shared lib name handling code in some tests

[Matthias Baesken]

Backport 8313670

-------------

Commit messages:
 - Backport 6dba2026d72de6a67aa0209749ded8174b088904

Changes: https://git.openjdk.org/jdk21u-dev/pull/229/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=229&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8313670
  Stats: 98 lines in 8 files changed: 21 ins; 60 del; 17 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/229.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/229/head:pull/229

PR: https://git.openjdk.org/jdk21u-dev/pull/229