RFR: JDK-8295710 : unify os::dll_file_extension [v2]

[David Holmes]

On Tue, 25 Oct 2022 08:01:59 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

>> The os::dll_file_extension() function could be unified for the different OS platforms.
>
> Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove os::dll_file_extension

You need to remove it from ./share/runtime/os.hpp too. Thanks.

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Changes requested by dholmes (Reviewer).

PR: https://git.openjdk.org/jdk/pull/10782