Add support for macos arm64 (#97)

Author: Androz2091

deps/binding.gyp

@@ -202,6 +202,22 @@
                 "opus/silk/float",
             ],
             "defines": ["PIC", "HAVE_CONFIG_H"],
+            "conditions": [
+                [
+                    "target_arch==\"arm64\"",
+                    {
+                        "sources": [
+                            "opus/celt/arm/arm_celt_map.c",
+                            "opus/celt/arm/armcpu.c",
+                            "opus/celt/arm/celt_neon_intr.c",
+                            "opus/celt/arm/pitch_neon_intr.c",
+                        ],
+                        "include_dirs": [
+                            "opus",
+                        ],
+                    }
+                ],
+            ],
         },
     ],
 }