remove univeral build from prebuilds

Author: baileympearson

binding.gyp

@@ -33,20 +33,7 @@
               '<(module_root_dir)/deps/zstd/build/cmake/lib/libzstd.a',
               ]
             },
-          }
-        ],
-        ['ARCH=="arm64"', {
-          'xcode_settings': {
-            "OTHER_CFLAGS": [
-              "-arch x86_64",
-              "-arch arm64"
-            ],
-            "OTHER_LDFLAGS": [
-              "-arch x86_64",
-              "-arch arm64"
-            ]
-          }
-        }]
+          }]
       ],
     'cflags!': [ '-fno-exceptions' ],
     'cflags_cc!': [ '-fno-exceptions' ],