RFR: 8332740: [BACKOUT] JDK-8331081 'internal proprietary API' diagnostics if --system is configured to an earlier JDK version

[Daniel D. Daugherty]

This reverts commit 2170e99cb49a4ef2086ecec7515a72d56148d0f2.

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Commit messages:
 - Revert "8331081: 'internal proprietary API' diagnostics if --system is configured to an earlier JDK version"

Changes: https://git.openjdk.org/jdk/pull/19352/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19352&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8332740
  Stats: 141 lines in 2 files changed: 0 ins; 132 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/19352.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19352/head:pull/19352

PR: https://git.openjdk.org/jdk/pull/19352