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

[Andrew Haley]

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.

make/autoconf/toolchain.m4 line 237:

> 235:     if test -n "$XCODEBUILD"; then
> 236:       # On Mac OS X, default toolchain to clang after Xcode 5
> 237:       XCODE_VERSION_OUTPUT=`"$XCODEBUILD" -version 2>&1 | $HEAD -n 1`

What's the warning? If it is truly expected, shouldn't it go to /dev/null ?

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