Apply patch from Alexander Botero-Lowry that adds FreeBSD platform

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 36 matching lines @@
       'CXXFLAGS':     ['$CCFLAGS', '-fno-rtti', '-fno-exceptions'],
       'LIBS':         ['pthread']
     },
     'mode:debug': {
       'CCFLAGS':      ['-g', '-O0'],
       'CPPDEFINES':   ['ENABLE_DISASSEMBLER', 'DEBUG']
     },
     'mode:release': {
       'CCFLAGS':      ['-O3', '-fomit-frame-pointer']
     },
+    'os:freebsd': {
+      'LIBS':         ['execinfo']
+    },
     'wordsize:64': {
       'CCFLAGS':      ['-m32'],
       'LINKFLAGS':    ['-m32']
     }
   },
   'msvc': {
     'all': {
       'DIALECTFLAGS': ['/nologo'],
       'CCFLAGS':      ['$DIALECTFLAGS', '$WARNINGFLAGS'],
       'CXXFLAGS':     ['$CCFLAGS', '/GR-', '/Gy'],
@@ skipping 112 matching lines @@
 SAMPLE_FLAGS = {
   'all': {
     'CPPPATH': [join(abspath('.'), 'include')],
     'LIBS': ['$LIBRARY'],
   },
   'gcc': {
     'all': {
       'LIBS': ['pthread'],
       'LIBPATH': ['.']
     },
+    'os:freebsd': {
+      'LIBS':         ['execinfo']
+    },
     'wordsize:64': {
       'CCFLAGS':      ['-m32'],
       'LINKFLAGS':    ['-m32']
     },
     'mode:release': {
       'CCFLAGS':      ['-O2']
     },
     'mode:debug': {
       'CCFLAGS':      ['-g', '-O0']
     }
@@ skipping 58 matching lines @@
 WORDSIZE_GUESS = utils.GuessWordsize()
 
 
 SIMPLE_OPTIONS = {
   'toolchain': {
     'values': ['gcc', 'msvc'],
     'default': TOOLCHAIN_GUESS,
     'help': 'the toolchain to use'
   },
   'os': {
-    'values': ['linux', 'macos', 'win32'],
+    'values': ['freebsd', 'linux', 'macos', 'win32'],
     'default': OS_GUESS,
     'help': 'the os to build for'
   },
   'arch': {
     'values':['arm', 'ia32'],
     'default': ARCH_GUESS,
     'help': 'the architecture to build for'
   },
   'snapshot': {
     'values': ['on', 'off'],
@@ skipping 256 matching lines @@
     context = BuildSpecific(env.Copy(), mode, env_overrides)
     libraries += context.library_targets
     cctests += context.cctest_targets
     samples += context.sample_targets
     d8s += context.d8_targets
 
   env.Alias('library', libraries)
   env.Alias('cctests', cctests)
   env.Alias('sample', samples)
   env.Alias('d8', d8s)
-  
+
   if env['sample']:
     env.Default('sample')
   else:
     env.Default('library')
 
 
 # We disable deprecation warnings because we need to be able to use
 # env.Copy without getting warnings for compatibility with older
 # 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()