Statically enable a couple of target features always enabled on arm64 macOS

Ring fails to compile when they are not statically enabled when
compiling for macOS.

Fixes #1522

Author: bjorn3

src/lib.rs

@@ -191,9 +191,20 @@ impl CodegenBackend for CraneliftCodegenBackend {
         if sess.target.arch == "x86_64" && sess.target.os != "none" {
             // x86_64 mandates SSE2 support
             vec![Symbol::intern("fxsr"), sym::sse, Symbol::intern("sse2")]
-        } else if sess.target.arch == "aarch64" && sess.target.os != "none" {
-            // AArch64 mandates Neon support
-            vec![sym::neon]
+        } else if sess.target.arch == "aarch64" {
+            match &*sess.target.os {
+                "none" => vec![],
+                // On macOS the aes, sha2 and sha3 features are enabled by default and ring
+                // fails to compile on macOS when they are not present.
+                "macos" => vec![
+                    sym::neon,
+                    Symbol::intern("aes"),
+                    Symbol::intern("sha2"),
+                    Symbol::intern("sha3"),
+                ],
+                // AArch64 mandates Neon support
+                _ => vec![sym::neon],
+            }
         } else {
             vec![]
         }