[jdk17u-dev] RFR: 8280863: Update build README to reflect that MSYS2 is supported

[Christoph Langer]

On Sat, 9 Jul 2022 11:56:12 GMT, George Adams <duke at openjdk.org> wrote:

> Backport [JDK-8280863](https://bugs.openjdk.org/browse/JDK-8280863) as it's a non trivial change

> 
> * [8280863: Update build README to reflect that MSYS2 is supported #540](https://github.com/openjdk/jdk17u-dev/pull/540)
> * [8287724: Fix various issues with msys2 #541](https://github.com/openjdk/jdk17u-dev/pull/541)
> * [8287896: PropertiesTest.sh fail on msys2 #542](https://github.com/openjdk/jdk17u-dev/pull/542)
> * [8287895: Some langtools tests fail on msys2 #543](https://github.com/openjdk/jdk17u-dev/pull/543)
> 
> Would you mind adding the fix request labels for these as I don't have author status yet

I've added the JBS labels/requests on your behalf and approved them at once. You're good to go for integration.

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PR: https://git.openjdk.org/jdk17u-dev/pull/540