RFR: 8344319: SM cleanup in jdk.dynlink module

[Roger Riggs]

Refactor to remove use of SecurityManager

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

Commit messages:
 - 8344319: SM cleanup in jdk.dynlink module

Changes: https://git.openjdk.org/jdk/pull/22152/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22152&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344319
  Stats: 237 lines in 13 files changed: 0 ins; 206 del; 31 mod
  Patch: https://git.openjdk.org/jdk/pull/22152.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22152/head:pull/22152

PR: https://git.openjdk.org/jdk/pull/22152