[jdk21u-dev] RFR: 8372977: Unnecessary gthread-2.0 loading

[Goetz Lindenmaier]

I backport this for parity with 21.0.11-oracle.

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Commit messages:
 - Backport 5ea2b6402114d34465b2ad9e476ab8e36ddeea06

Changes: https://git.openjdk.org/jdk21u-dev/pull/2515/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2515&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8372977
  Stats: 27 lines in 2 files changed: 0 ins; 27 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2515.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2515/head:pull/2515

PR: https://git.openjdk.org/jdk21u-dev/pull/2515