Always add LC_BUILD_VERSION for metadata object files

As of Xcode 15 Apple's linker has become a bit more strict about the
warnings it produces. One of those new warnings requires all valid
Mach-O object files in an archive to have a LC_BUILD_VERSION load
command:

```
ld: warning: no platform load command found in 'ARCHIVE[arm64][2106](lib.rmeta)', assuming: iOS-simulator
```

This was already being done for Mac Catalyst so this change expands this
logic to include it for all Apple platforms. I filed this behavior
change as FB12546320 and was told it was the new intentional behavior.

1 files changed, 3 insertions, 5 deletions

diff --git a/compiler/rustc_driver_impl/src/lib.rs b/compiler/rustc_driver_impl/src/lib.rs
index 7bbed0877f0..4df4cc7a71c 100644
--- a/compiler/rustc_driver_impl/src/lib.rs
+++ b/compiler/rustc_driver_impl/src/lib.rs
@@ -858,11 +858,9 @@ fn print_crate_info(
                 use rustc_target::spec::current_apple_deployment_target;
 
                 if sess.target.is_like_osx {
-                    println_info!(
-                        "deployment_target={}",
-                        current_apple_deployment_target(&sess.target)
-                            .expect("unknown Apple target OS")
-                    )
+                    let (major, minor) = current_apple_deployment_target(&sess.target)
+                        .expect("unknown Apple target OS");
+                    println_info!("deployment_target={}", format!("{major}.{minor}"))
                 } else {
                     handler
                         .early_error("only Apple targets currently support deployment version info")