[jdk18] RFR: 8279702: [macosx] ignore xcodebuild warnings on M1

[Christoph Langer]

On Wed, 12 Jan 2022 09:42:07 GMT, Johannes Bechberger <duke at openjdk.java.net> wrote:

> Simple change to `make/autoconf/toolchain.m4` to fix the bug as described in its title and description.

You’re too quick. This needs a review from somebody in the build group.

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PR: https://git.openjdk.java.net/jdk18/pull/95