Introduce a notion of "v8_code" in gyp config files.

src/d8.gyp

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 {
-  'includes': ['../build/common.gypi'],
   'variables': {
+    'v8_code': 1,
     'console%': '',
     # Enable support for Intel VTune. Supported on ia32/x64 only
     'v8_enable_vtunejit%': 0,
   },
+  'includes': ['../build/common.gypi'],
   'targets': [
     {
       'target_name': 'd8',
       'type': 'executable',
       'dependencies': [
         '../tools/gyp/v8.gyp:v8',
       ],
       # Generated source files need this explicitly:
       'include_dirs+': [
         '../src',
@@ skipping 66 matching lines @@
             '<@(_outputs)',
             'D8',
             'off',  # compress startup data
             '<@(js_files)'
           ],
         },
       ],
     }
   ],
 }