RFR: 8351309: test/hotspot/jtreg/runtime/posixSig/TestPosixSig.java fails on static-jdk

[Jiangli Zhou]

Please review this PR that excludes `libjsig` from being statically linked with `static-jdk` `java` launcher by default. Please see details in https://bugs.openjdk.org/browse/JDK-8351309 description and comments. Thanks

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Commit messages:
 - Filter out libjsig by default for static JDK.

Changes: https://git.openjdk.org/jdk/pull/23924/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23924&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8351309
  Stats: 7 lines in 1 file changed: 6 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/23924.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23924/head:pull/23924

PR: https://git.openjdk.org/jdk/pull/23924