RFR: 8326587: Split Link.gmk into a Windows and Unix part

[Magnus Ihse Bursie]

On Fri, 23 Feb 2024 16:24:48 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> There is not much overlap on how linking is done on Windows on one hand, and on all Unix platforms on the other. This makes Link.gmk basically consists of two parts, each in it own half of if statements, and the few common parts are artificially shoehorned in to fit both sides.
> 
> The code will be much clearer if we just split this into two different files.
> 
> Note that this PR slightly collides with JDK-8326583 (https://github.com/openjdk/jdk/pull/17986). Whichever of this goes in first will mean that the other one needs to make some adaptations.

I have verified that there is no differences in the resulting output using COMPARE_BUILD, for the platforms in Oracle's CI: windows-x64,linux-x64,linux-aarch64,macosx-x64,macosx-aarch64, confirming that this is a pure build system refactoring.

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PR Comment: https://git.openjdk.org/jdk/pull/17987#issuecomment-1962011909