RFR: 8277489: Rewrite JAAS UnixLoginModule with FFM [v10]

[Weijun Wang]

> Rewrite the native calls with FFM.

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

  unnecessary initialization

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/28931/files
  - new: https://git.openjdk.org/jdk/pull/28931/files/99604e06..0aec40c0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28931&range=09
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28931&range=08-09

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 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