8233880: Support compilers with multi-digit major version numbers

[omikhaltsova]

I'd like to backport JDK-8233880 to jdk13u for parity with jdk11u.
The original patch applied cleanly.
Checked this configure warning fix manually on Ubuntu 20.04 with gcc 10.2.0.

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
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Issue

• JDK-8233880: Support compilers with multi-digit major version numbers

Download

$ git fetch https://git.openjdk.java.net/jdk13u-dev pull/137/head:pull/137
$ git checkout pull/137

[bridgekeeper]

👋 Welcome back omikhaltcova! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[openjdk]

@omikhaltsova This change now passes all automated pre-integration checks.

After integration, the commit message for the final commit will be:

8233880: Support compilers with multi-digit major version numbers

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

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[mlbridge]

Webrevs

• 00: Full (a60545e)

[omikhaltsova]

/integrate

[yan-too]

/integrate

[yan-too]

/sponsor

[openjdk]

@omikhaltsova
Your change (at version a60545e) is now ready to be sponsored by a Committer.

[openjdk]

@yan-too Only the author (@omikhaltsova) is allowed to issue the integrate command. As this PR is ready to be sponsored, and you are an eligible sponsor, did you mean to issue the /sponsor command?

[openjdk]

@yan-too @omikhaltsova Pushed as commit 2f2f2de.

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