RFR: Small updates to jdk.json mapping

[Joe Darcy]

Simplify AIX libjli mapping and remove various HotSpot regression tests from core-libs-dev.

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

Commit messages:
 - small update

Changes: https://git.openjdk.java.net/skara/pull/751/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=751&range=00
  Stats: 10 lines in 1 file changed: 0 ins; 9 del; 1 mod
  Patch: https://git.openjdk.java.net/skara/pull/751.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/751/head:pull/751

PR: https://git.openjdk.java.net/skara/pull/751