RFR: 8256860: S390 builds broken after JDK-8254231

Mon Nov 23 15:44:13 UTC 2020

Foreign linker integration broke S390 builds. This change stubs out the new entry points, without implementing the actual support yet.

Additional testing:
 - [x] Linux s390x fastdebug cross-compilation

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

Commit messages:
 - 8256860: S390 builds broken after JDK-8254231

Changes: https://git.openjdk.java.net/jdk/pull/1392/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1392&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8256860
  Stats: 146 lines in 7 files changed: 146 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1392.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1392/head:pull/1392

PR: https://git.openjdk.java.net/jdk/pull/1392