RFR: 8257858: [macOS]: Remove JNF dependency from libosxsecurity/KeystoreImpl.m [v2]

[Weijun Wang]

On Fri, 29 Jan 2021 22:05:21 GMT, Phil Race <prr at openjdk.org> wrote:

>> So I should remember how env was retrieved and only detach when it's from `AttachCurrentThreadAsDaemon`? In fact, in my test the plain `GetEnv` has never succeeded and it was always attached.
>
> Yes that is the idea. BTW which thread was it attached to in what you saw ?

It's a new thread in the main group. After the method finishes, the thread exits (`Thread::exit`).

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