build: update configure for Node.js 12

[richardlau]

Refs: #26714

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• commit message follows commit guidelines

[nodejs-github-bot]

@richardlau build started: https://ci.nodejs.org/blue/organizations/jenkins/node-test-pull-request-lite-pipeline/detail/node-test-pull-request-lite-pipeline/2944/pipeline

[richardlau]

Note that this check is a warning and doesn't prevent you attempting to use older compilers.

[richardlau]

CI: https://ci.nodejs.org/job/node-test-pull-request/21612/ (✔️)

[mscdex]

If this is just a warning, perhaps the language in the commit message is a bit too strong?

[richardlau]

If this is just a warning, perhaps the language in the commit message is a bit too strong?

¯\_(ツ)_/¯ It's the language we used in previous commits (79773f8, b4f59a7). I used build rather than doc as the subsystem as I felt it's more appropriate).

[refack]

Note that this check is a warning and doesn't prevent you attempting to use older compilers.

IMHO that makes this not semver-major, just a "don't land on X"

[targos]

I agree. #26714 being semver-major is enough

[richardlau]

Updated the commit message and clang level. PTAL.

New CI: https://ci.nodejs.org/job/node-test-pull-request/21714/ (✔️)

[refack]

I think it's good to capture the state of things with this PR right now.
_{I'm hoping to break everything in #26725 anyway 🤞}

[richardlau]

Landed in 41ba699.