Fix GH-20767: build failure with preserve_none attribute enabled on mac.

[devnexen]

Established that build < 1700.4.4.1 tends to fail thus we disable the preserve_none attribute feature for these cases.

[dktapps]

This doesn't fix the issue for me. I also don't see any sign of the Apple clang build train message in my config.log.

Output of clang --version if it's helpful:

% clang --version
Apple clang version 17.0.0 (clang-1700.0.13.5)
Target: arm64-apple-darwin24.6.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin

[dktapps]

Removing the -n from the sed command allowed it to check the version, but the check still passes. Looks like AS_VERSION_COMPARE doesn't understand it.

It might be better to use this, which is defined by clang:

#define __apple_build_version__ 17000013

The working version should be 17000404 I believe.

[devnexen]

let me know if this is working out for you this time. Cheers.

[dktapps]

Yep, that did the trick