Don't force-export V8 symbols unless v8 is built as a shared library.

SConstruct

 # Copyright 2008 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 108 matching lines @@
       'CCFLAGS':      ['-O3', '-fomit-frame-pointer', '-fdata-sections',
                        '-ffunction-sections'],
       'os:android': {
         'CCFLAGS':    ['-mthumb', '-Os'],
         'CPPDEFINES': ['SK_RELEASE', 'NDEBUG', 'ENABLE_DEBUGGER_SUPPORT']
       }
     },
     'os:linux': {
       'CCFLAGS':      ['-ansi'] + GCC_EXTRA_CCFLAGS,
       'library:shared': {
+        'CPPDEFINES': ['V8_SHARED'],
         'LIBS': ['pthread']
       }
     },
     'os:macos': {
       'CCFLAGS':      ['-ansi', '-mmacosx-version-min=10.4'],
     },
     'os:freebsd': {
       'CPPPATH' : ['/usr/local/include'],
       'LIBPATH' : ['/usr/local/lib'],
       'CCFLAGS':      ['-ansi'],
@@ skipping 768 matching lines @@
 # version of scons.  Also, there's a bug in some revisions that
 # doesn't allow this flag to be set, so we swallow any exceptions.
 # Lovely.
 try:
   SetOption('warn', 'no-deprecated')
 except:
   pass
 
 
 Build()