RFR: 8277489: Rewrite JAAS UnixLoginModule with FFM [v3]

[Weijun Wang]

> Rewrite the native calls with FFM.

Weijun Wang has updated the pull request incrementally with one additional commit since the last revision:

  error handling

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/28931/files
  - new: https://git.openjdk.org/jdk/pull/28931/files/8c0c7c0b..fa1a511c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28931&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28931&range=01-02

  Stats: 52 lines in 2 files changed: 34 ins; 0 del; 18 mod
  Patch: https://git.openjdk.org/jdk/pull/28931.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28931/head:pull/28931

PR: https://git.openjdk.org/jdk/pull/28931