RFR: 8303485: Replacing os.name for operating system customization

[Mandy Chung]

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On Thu, 9 Mar 2023 16:03:37 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

>> I would argue that we should keep the replacement string matching the make variable its getting the value from. It makes it easier to trace the origin of the value. 
>> 
>> Using the terms `CURRENT` or `TARGET` inside the java class is less clear. `TARGET` is a references to how the JDK was built while `CURRENT` is more of a reference to the current runtime. Both are correct, it's more about what mental model we want at this level.
>
> The symbol has to match the build usage of OPENJDK_TARGET_OS, not the name.

The one in the template file is independent to the build variables.

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PR: https://git.openjdk.org/jdk/pull/12931