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

[George Adams]

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

This pull request has now been integrated.

Changeset: 204e67a7
Author:    George Adams <georgeadams1995 at gmail.com>
Committer: Christoph Langer <clanger at openjdk.org>
URL:       https://git.openjdk.org/jdk17u-dev/commit/204e67a7adedc5ff8ed6dbe1da7aa1397c9beb38
Stats:     6 lines in 2 files changed: 0 ins; 0 del; 6 mod

8280863: Update build README to reflect that MSYS2 is supported

Reviewed-by: clanger
Backport-of: 6de90ad9800b83c4a5f364c3645603fcb6828d6c

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