Merge rust-bitcoin/bitcoind#38: Add M1 target arch to bitcoin download

4c1d432 Add M1 target arch to bitcoin download (Charlie Little)

Pull request description:

  Resolves Blockstream#36

Top commit has no ACKs.

Tree-SHA512: d96911d7bbb2c323196c49bcc132eb43e471b2bceca4d1df9d1394d873793fa84475177d52117ec775e833e2b2baa59f9bf6cc2876fb0c9f8a6601714518b24c

Author: RCasatta

build.rs

@@ -8,7 +8,10 @@ use tar::Archive;
 
 include!("src/versions.rs");
 
-#[cfg(all(target_os = "macos", target_arch = "x86_64"))]
+#[cfg(all(
+    target_os = "macos",
+    any(target_arch = "x86_64", target_arch = "aarch64")
+))]
 fn download_filename() -> String {
     format!("bitcoin-{}-osx64.tar.gz", &VERSION)
 }