Fix macOS optical E1000: hold a DiskArbitration claim for the session

The macOS SCSI transport took exclusive SCSI access plus a one-shot
`diskutil unmountDisk`, but never claimed the disc from DiskArbitration.
diskarbitrationd was therefore free to remount the volume mid-rip (a
Spotlight re-probe is the usual trigger), yanking the device out from
under an in-progress read; the failure surfaced to the user as E1000.

Hold a DADiskClaim plus a mount-approval dissenter scoped to our disc for
the transport lifetime, so the OS cannot remount it until shim_close().
Link the DiskArbitration framework in build.rs.

build.rs

@@ -5,6 +5,7 @@ fn main() {
     if target == "macos" {
         println!("cargo:rustc-link-lib=framework=IOKit");
         println!("cargo:rustc-link-lib=framework=CoreFoundation");
+        println!("cargo:rustc-link-lib=framework=DiskArbitration");
 
         let out_dir = std::env::var("OUT_DIR").unwrap();
         let obj = format!("{out_dir}/macos_shim.o");