RFR: 8280863: Update build README to reflect that MSYS2 is supported [v2]

Fri Jan 28 10:53:19 UTC 2022

On Fri, 28 Jan 2022 09:12:06 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> TheShermanTanker has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:
>> 
>>  - Clean up documentation and MSys 2 -> MSYS2
>>  - Update documentation to mention MSys 2 support
>
> I'm not quite sure of the best way to help you with the html part. I've pushed a fix to https://github.com/magicus/jdk/tree/pull/7242, it is available as commit https://github.com/openjdk/jdk/commit/85024eb1e84425ead40fcc2278ca085ca8fbb5df. Try merging that into your branch.

@magicus Thank you!

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