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

[David Holmes]

On Thu, 9 Mar 2023 17:12:53 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.
>> 
>> 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.

IMO the naming should make sense from the perspective of reading the post-processed source file - so the variable should refer to "current" not "target".

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