RFR: 8257679: Improved unix compatibility layer in Windows build (winenv) (Update building.md and building.html to reflect change)

Thu Jan 27 14:53:34 UTC 2022

On Thu, 27 Jan 2022 08:49:08 GMT, TheShermanTanker <duke at openjdk.java.net> wrote:

> Ever since [JDK-8257679](https://bugs.openjdk.java.net/browse/JDK-8257679) was merged in 16, MSys 2 became capable of building a functional JDK on Windows. This PR updates some outdated documentation in building.html and building.md to reflect that change.
> 
> I appreciate any reviews, and would like to know how I might be able to improve the wording of both updated docs, if possible.

@TheShermanTanker Some comments in no particular order.

* The MSYS2 project calls themselves "MSYS2"; I think it'd be proper to reflect this capitalization/lack of space before the 2. 

* This PR has technical problems. You are trying to reuse the old JBS bug issue. You'll need a new bug entry for the problem you are trying to solve here. If you do not have access to the bug system, let me know and I can help you.

* I have actually a similar fix on a personal branch, where I'm updating several omissions in the build README. However, when I went to try building on an MSYS2 installation with the mainline head, it actually failed.. :-( Have you successfully built on MSYS2 with the mainline JDK?

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PR: https://git.openjdk.java.net/jdk/pull/7242