Enable ARM64 assembler on Apple Silicon

https://github.com/openssl/openssl/pull/12369

config/20-all-platforms.conf

@@ -77,13 +77,13 @@ my %targets = ();
 
     # Base (arm64)
     "darwin64-arm64-cc" => {
-        inherit_from     => [ "darwin-common" ],
+        inherit_from     => [ "darwin-common", asm("aarch64_asm") ],
         CFLAGS           => add("-Wall"),
         cflags           => add("-arch arm64"),
         lib_cppflags     => add("-DL_ENDIAN"),
         bn_ops           => "SIXTY_FOUR_BIT_LONG",
-        perlasm_scheme   => "macosx",
-     },
+        perlasm_scheme   => "ios64",
+    },
 
     # Device (x86_64)
     "macos64-x86_64" => {