[jdk11u-dev] RFR: 8263856: Github Actions for macos/aarch64 cross-build [v2]

[Vladimir Kempik]

> PLease review this backport to jdk11u-dev
> it enables github CI crossbuilds of macos-aarch64
> Not applying clean due to gtest and few configure options, remade the patch basing on macos-intel part of existing jdk11u-dev job

Vladimir Kempik has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains three commits:

 - 8263856: Github Actions for macos/aarch64 cross-build
 - Merge branch 'master' into JDK-8260518
 - 8260518: Change default -mmacosx-version-min to 10.12

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Changes: https://git.openjdk.java.net/jdk11u-dev/pull/826/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=826&range=01
  Stats: 107 lines in 4 files changed: 103 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/826.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/826/head:pull/826

PR: https://git.openjdk.java.net/jdk11u-dev/pull/826