RFR: 8257858: [macOS]: Remove JNF dependency from libosxsecurity/KeystoreImpl.m [v8]

[Weijun Wang]

> This fix covers both
> 
> - [[macOS]: Remove JNF dependency from libosxsecurity/KeystoreImpl.m](https://bugs.openjdk.java.net/browse/JDK-8257858)
> - [[macOS]: Remove JNF dependency from libosxkrb5/SCDynamicStoreConfig.m](https://bugs.openjdk.java.net/browse/JDK-8257860)

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

  valerie comment, remove useless test

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1845/files
  - new: https://git.openjdk.java.net/jdk/pull/1845/files/b5f1e15d..41fed31f

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1845&range=07
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1845&range=06-07

  Stats: 107 lines in 2 files changed: 2 ins; 105 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1845.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1845/head:pull/1845

PR: https://git.openjdk.java.net/jdk/pull/1845