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

[Roger Riggs]

On Thu, 9 Mar 2023 17:07:28 GMT, Mandy Chung <mchung at openjdk.org> wrote:

>> The one in the template file is independent to the build variables.
>
>> 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.
> 
> Then we can define a new make variable that will also allow it be a different value than `OPENJDK_TARGET_OS` if desirable.

There is no need to define a new variable, there are already too many in the build and the build and the compiled files should be using the same symbols.

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