Fix presubmit error in copyright message.

Use new gcc flag -Wno-unused-but-set-variable only on linux.
TBR=fschneider@chromium.org

BUG=
TEST=

Review URL: http://codereview.chromium.org/7457018

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@8689 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

SConstruct

@@ -398,13 +398,13 @@ CCTEST_EXTRA_FLAGS = {
   'gcc': {
     'all': {
       'LIBPATH':      [abspath('.')],
-      'CCFLAGS':      ['$DIALECTFLAGS', '$WARNINGFLAGS',
-                       '-Wno-unused-but-set-variable'],
+      'CCFLAGS':      ['$DIALECTFLAGS', '$WARNINGFLAGS'],
       'CXXFLAGS':     ['-fno-rtti', '-fno-exceptions'],
       'LINKFLAGS':    ['$CCFLAGS'],
     },
     'os:linux': {
       'LIBS':         ['pthread'],
+      'CCFLAGS':      ['-Wno-unused-but-set-variable'],
     },
     'os:macos': {
       'LIBS':         ['pthread'],

src/jsregexp.cc

-// Copyright 2006-2009, 2011 the V8 project authors. All rights reserved.
+// Copyright 2011 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: