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Rollup merge of #136558 - madsmtm:apple-host-tooling, r=jieyouxu

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Document minimum supported host tooling on macOS

In particular we support macOS 10.12 (same as for binaries produced by `rustc`) and Xcode 9.2 (the highest Xcode version that runs on macOS 10.12.6). I have this installed on a MacBook Pro from 2013 that sits below my desk, and am occasionally testing it.

I am documenting this now because it was unclear in https://github.com/rust-lang/rust/issues/136523.

(I'm not inherently against bumping these one day, but that's a separate discussion, let's at least document what we support right now).

`@rustbot` label O-macos
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src/doc/rustc/src/platform-support/apple-darwin.md
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@ -30,6 +30,18 @@ The current default deployment target for `rustc` can be retrieved with
[deployment target]: https://developer.apple.com/library/archive/documentation/DeveloperTools/Conceptual/cross_development/Configuring/configuring.html
[rustc-print]: ../command-line-arguments.md#option-print
### Host tooling
The minimum supported OS versions for the host tooling (`rustc`, `cargo`,
etc.) are currently the same as for applications, namely 10.12 on x86 and 11.0
on ARM64.
The minimum supported Xcode version is 9.2.
Building from source likely requires that you can build LLVM from source too,
which [currently][llvm-os] requires Xcode 10.0 and macOS 10.13 (for LLVM 19).
[llvm-os]: https://releases.llvm.org/19.1.0/docs/GettingStarted.html#host-c-toolchain-both-compiler-and-standard-library
### Binary format
The default binary format is Mach-O, the executable format used on Apple's