RFR: JDK-8282532: Allow explicitly setting build platform alongside --openjdk-target [v10]

[Magnus Ihse Bursie]

On Fri, 4 Mar 2022 07:51:36 GMT, Julian Waters <jwaters at openjdk.org> wrote:

>> Currently the only other option for manually configuring the build platform while cross compiling are devkits, which don't work on certain systems and are also more focused on differentiating the build and target compilers instead. This patch adds the ability to explicitly set the build platform through a new option, which can be especially helpful for when autodetection fails and devkits cannot be relied on, and also for simpler cross compilation cases (Like the one described in building.md)
>> 
>> WIP: Translation from markdown to html
>
> Julian Waters has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Manual revert again, I swear I'm using the correct pandoc version, I'm confused as to why this is happening
>  - I think I'm beginning to hate pandoc :(

This still looks weird. I'm beginning to feel sorry for you and all your troubles. :-( 

I took the "real" changes in this PR and applied them to a new branch in my own personal fork, and regenerated the html file properly (I also fixed trailing spaces...)

This is available at https://github.com/magicus/jdk/tree/configure-explicit-build-platform. 

At this point the current PR is really messed up. My recommendation is that you either close this PR and let me integrate my branch, setting you as the contributor, or that you reset this branch back to master, import my branch, and force-push to your branch. (It is normally not recommended, and frowned upon, to do force pushes, but in this case it would be appropriate.)

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PR: https://git.openjdk.java.net/jdk/pull/7656