Link against librt on solaris for semaphore and scheduler symbols

tools/gyp/v8.gyp

 # 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 1408 matching lines @@
             ]},
             'sources': [
               '../../src/base/platform/platform-openbsd.cc',
               '../../src/base/platform/platform-posix.cc'
             ],
           }
         ],
         ['OS=="solaris"', {
             'link_settings': {
               'libraries': [
-                '-lnsl',
+                '-lnsl -lrt',
             ]},
             'sources': [
               '../../src/base/platform/platform-solaris.cc',
               '../../src/base/platform/platform-posix.cc'
             ],
           }
         ],
         ['OS=="mac"', {
           'sources': [
             '../../src/base/platform/platform-macos.cc',
@@ skipping 300 matching lines @@
         }],
         ['v8_compress_startup_data=="bz2"', {
           'libraries': [
             '-lbz2',
           ]
         }],
       ],
     },
   ],
 }