RFR: 8295229: Try to verify gtest version [v2]

[Dingli Zhang]

On Wed, 12 Oct 2022 14:20:08 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> Inspired by the comment https://github.com/openjdk/jdk/pull/10503#issuecomment-1275500585 for JDK-8294623, I realized we need to do at least some kind of version verification of gtest.
>> 
>> Since gtest do not properly declare its version, this can't be done exactly, but we can look at some tell-tales and rule out versions that are way too far off.
>> 
>> I also updated the testing documentation to point to the build information about how to point to the gtest source, and the version requirements.
>
> Magnus Ihse Bursie 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:
> 
>  - Merge branch 'master' into try-verify-gtest-version
>  - 8295229: Try to verify gtest version

@magicus I truly appreciate your timely help!
It will be a convenient move for new developers.

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PR: https://git.openjdk.org/jdk/pull/10677