RFR: JDK-8313670: Simplify shared lib name handling code in some tests [v4]

[Matthias Baesken]

> There is coding e.g. in
> https://github.com/openjdk/jdk/blob/master/test/jdk/jdk/jfr/event/runtime/TestNativeLibrariesEvent.java#L72
> that deals with shared lib naming on different OS.
> This code should be simplified.

Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:

  adjust COPYRIGHT headers

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15151/files
  - new: https://git.openjdk.org/jdk/pull/15151/files/9f9c5b25..5e8dfa79

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15151&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15151&range=02-03

  Stats: 6 lines in 6 files changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/15151.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15151/head:pull/15151

PR: https://git.openjdk.org/jdk/pull/15151