Define _AMD64_, MP_CHAR_STORE_SLOW, and MP_IS_LITTLE_ENDIAN

nss.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.
 
 {
   'variables': {
     'conditions': [
       ['OS=="ios"', {
         'exclude_nss_root_certs%': 0,
         'exclude_nss_libpkix%': 0,
@@ skipping 1118 matching lines @@
                 'MP_ASSEMBLY_DIV_2DX1D',
                 'MP_USE_UINT_DIGIT',
                 'MP_NO_MP_WORD',
               ],
             }],
             ['target_arch=="x64"', {
               'defines': [
                 'NSS_USE_64',
                 'NSS_X86_OR_X64',
                 'NSS_X64',
+                '_AMD64_',
+                'MP_CHAR_STORE_SLOW',
+                'MP_IS_LITTLE_ENDIAN',
                 'WIN64',
               ],
               'sources!': [
                 'mozilla/security/nss/lib/freebl/mpi/mpi_amd64.c',
                 'mozilla/security/nss/lib/freebl/mpi/mpi_x86_asm.c',
               ],
             }],
           ],
         }, { # else: OS!="win"
           'sources!': [
@@ skipping 21 matching lines @@
             '-Wno-incompatible-pointer-types',
             '-Wno-logical-op-parentheses',
             '-Wno-switch',
             '-Wno-tautological-compare',
           ],
         }],
       ],
     },
   ],
 }