Issue 6063, 6531 - Update V8 to 6.5.254.41, use C++14 and NDK-r16b

build-v8.gypi

 {
   'includes': ['common.gypi'],
   'variables': {
     'v8_enable_i18n_support': 0,
     'v8_optimized_debug': 0,
     'v8_use_external_startup_data': 0,
     'v8_use_snapshot': 1,
     'v8_random_seed%': 0,
     'v8_android_log_stdout': 1,
   },
 
   'target_defaults': {
     'defines': [
       '__ANDROID_API__=16',
     ],
   },
   'conditions': [
+    ['OS=="linux" or OS=="mac"', {
+      'target_defaults': {
+        'cflags': [ '-fPIC' ],
+        'cflags_cc': [ '-fPIC' ]
+      }
+    }],
     ['OS=="win"', {
       'target_defaults': {
         'configurations': {
           'Debug': {
             'conditions': [
               ['target_arch=="x64"', {
                 'msvs_settings': {
                   'VCCLCompilerTool': {
                     'AdditionalOptions': [
                       '/bigobj', # compiling fatal error C1128: number of sections exceeded object file format limit: compile with /bigobj
                     ]
                   }
                 }
               }]
             ],
           }
         },
         'msvs_settings': {
           'VCCLCompilerTool': {
             'WarningLevel': 0,
           },
         },
       }
     }]
   ],
 }