RFR: JDK-8274434: move os::get_default_process_handle and os::dll_lookup to os_posix for POSIX platforms

[Lutz Schmidt]

On Tue, 28 Sep 2021 11:13:00 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> Hello, please review this small change.
> The os::get_default_process_handle and os::dll_lookup functions are pretty similar across the POSIX platforms so they can be moved to os_posix.cpp.

Changes look good to me. 
With respect to the Apple special casing I have requested an opinion from knowledgeable people. I would suggest to wait 24 hours for feedback.

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Changes requested by lucy (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/5737