Rollup merge of #152192 - madsmtm:remove-use-xcode-clang, r=shepmaster Always use Xcode-provided Clang in macOS CI Most of our macOS CI runners use the Xcode-provided Clang. `dist-apple-various` still downloads Clang from LLVM's prebuilt sources, which is a bit problematic, because we're still using the Xcode-provided _headers_. As a concrete example, using Xcode's Clang is required by https://github.com/rust-lang/rust/pull/152013, as otherwise updating to Xcode 26 headers fails with an obscure `fatal error: 'net/route.h' file not found`, see [this build log](https://github.com/rust-lang/rust/pull/152013#issuecomment-3838801617). I suspect this is because building the new headers isn't officially supported with the older LLVM/Clang 15. This PR removes that functionality, so that we instead always build with the Xcode-provided Clang. This is effectively the same as setting `USE_XCODE_CLANG=1` on `dist-apple-various` as well, but I thought I'd clean things up while I'm at it. I didn't find the reason why we did this in first place, maybe because the Xcode Clang at the time was too out of date to build LLVM? It doesn't seem to be a problem anymore though. r? t-infra
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