Switch armv7 setting to arm_version=7 in v8 gyp files

build/standalone.gypi

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 99 matching lines @@
         'os_posix%': 1,
       }],
       ['(v8_target_arch=="ia32" or v8_target_arch=="x64") and \
         (OS=="linux" or OS=="mac")', {
         'v8_enable_gdbjit%': 1,
       }, {
         'v8_enable_gdbjit%': 0,
       }],
     ],
     # Default ARM variable settings.
-    'armv7%': 'default',
+    'arm_version%': 'default',
     'arm_neon%': 0,
     'arm_fpu%': 'vfpv3',
     'arm_float_abi%': 'default',
     'arm_thumb': 'default',
   },
   'target_defaults': {
     'variables': {
       'v8_code%': '<(v8_code)',
     },
     'default_configuration': 'Debug',
@@ skipping 169 matching lines @@
         ],
         'target_conditions': [
           ['_type!="static_library"', {
             'xcode_settings': {'OTHER_LDFLAGS': ['-Wl,-search_paths_first']},
           }],
         ],  # target_conditions
       },  # target_defaults
     }],  # OS=="mac"
   ],
 }