Add target_arch=arm64 support.

libjpeg.gyp

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   # This file is not used when use_system_libjepg==1. Settings for building with
   # the system libjpeg is in third_party/libjpeg/libjpeg.gyp.
   'variables': {
     'shared_generated_dir': '<(SHARED_INTERMEDIATE_DIR)/third_party/libjpeg_turbo',
     'conditions': [
@@ skipping 162 matching lines @@
                 'simd/jsimd_arm.c',
                 'simd/jsimd_arm_neon.S',
               ],
             }, {
               'sources': [
                 'jsimd_none.c',
               ],
             }]
           ],
         }],
+        [ 'target_arch=="arm64"', {
+          'sources': [
+            'jsimd_none.c',
+          ],
+        }],
         [ 'target_arch=="mipsel"', {
           'sources': [
             'jsimd_none.c',
           ],
         }],
 
         # Build rules for an asm file.
         # On Windows, we use the precompiled yasm binary. On Linux, we build
         # our patched yasm and use it except when use_system_yasm is 1. On
         # Mac, we always build our patched yasm and use it because of
@@ skipping 109 matching lines @@
       ],
     },
   ],
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: