fixup! hvf: add Rust bindings

On MacOS, libclang.dylib does not usually know how to find the correct
SDK. (There's an exception for Nix-installed libclang.dylibs, which is
why this was working before). Use xcrun to set the sdk root so that we
can find the hvf bindings.

Signed-off-by: Lucy Menon <168595099+syntactically@users.noreply.github.com>

Author: syntactically

src/hyperlight_host/build.rs

@@ -113,9 +113,16 @@ fn main() -> Result<()> {
             "cargo:rerun-if-changed=src/hyperlight_host/src/hypervisor/virtual_machine/hvf/fp_abi.c"
         );
         println!("cargo:rustc-link-lib=framework=Hypervisor");
+        let sdk_path = std::process::Command::new("xcrun")
+            .args(["-sdk", "macosx", "-show-sdk-path"])
+            .output()?
+            .stdout;
+        let sdk_path = String::from_utf8_lossy(&sdk_path);
+        eprintln!("sdk path: {}", sdk_path.trim());
         bindgen::Builder::default()
-            .clang_args(&["-framework", "Hypervisor"])
             .clang_args(&[
+                "-isysroot",
+                sdk_path.trim(),
                 "-I",
                 &format!("{manifest_dir}/src/hypervisor/virtual_machine/hvf"),
             ])