Bundled macOS headers cannot be found using #include in assembly files

[alexrp]

Zig Version

0.13.0

Steps to Reproduce and Observed Behavior

❯ cat test.c
#include <mach/machine/vm_param.h>
int main(){}
❯ cat test.S
#include <mach/machine/vm_param.h>
❯ zig build-exe test.c -target x86_64-macos-none
❯ zig build-exe test.S -target x86_64-macos-none
error(compilation): clang failed with stderr: test.S:1:10: fatal error: 'mach/machine/vm_param.h' file not found
    1 | #include <mach/machine/vm_param.h>
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.

test.S:1:1: error: clang exited with code 1

Ran into this while trying to cross-compile libffi from Linux to Apple platforms with a build.zig script.

Expected Behavior

No error.