RFR: JDK-8273815: move have_special_privileges to os_posix for POSIX platforms

[Martin Doerr]

On Thu, 16 Sep 2021 07:20:39 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> We have identical have_special_privileges() for Linux/AIX/BSD so the function is a good candidate to be moved to os_posix.
> 
> Thanks, Matthias

Marked as reviewed by mdoerr (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/5540