RFR: 8368273: LIBPTHREAD dependency is not needed for some jdk libs

Mon Sep 22 12:45:40 UTC 2025

A couple of JDK native libs link to $(LIBPTHREAD) but the dependency is not needed.

libsctp has no `pthread*` calls so most likely we can omit $(LIBPTHREAD).
libawt_xawt only uses `pthread_self()` ; so on Linux it links without adding $(LIBPTHREAD) because it then uses `pthread_self() `from glibc;  however it might still be better to link $(LIBPTHREAD) in this special case.

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Commit messages:
 - JDK-8368273

Changes: https://git.openjdk.org/jdk/pull/27426/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27426&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8368273
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/27426.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27426/head:pull/27426

PR: https://git.openjdk.org/jdk/pull/27426