Support prebuilt binaries for MacOS on arm64

Author: adamcrume

tensorflow-sys/build.rs

@@ -65,11 +65,13 @@ fn main() {
         Err(_) => false,
     };
 
-    let target_os = target_os();
-    if !force_src
-        && target_arch() == "x86_64"
-        && (target_os == "linux" || target_os == "macos" || target_os == "windows")
-    {
+    let prebuilt_supported = match (&target_arch() as &str, &target_os() as &str) {
+        ("x86_64", "linux") => true,
+        ("x86_64", "windows") => true,
+        ("arm64", "macos") => true,
+        _ => false,
+    };
+    if !force_src && prebuilt_supported {
         install_prebuilt();
     } else {
         build_from_src();