Adding new marker for targets that rely on static library dependencies

traversing none type targets. In preparation for a gyp change to the default
behavior.

BUG=None
TEST=None
R=ager@chromium.org

Review URL: https://chromiumcodereview.appspot.com/7616013
Patch from Brad Nelson <bradnelson@google.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10579 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

tools/gyp/v8.gyp

@@ -32,6 +32,7 @@
       'targets': [
         {
           'target_name': 'v8',
+          'dependencies_traverse': 1,
           'conditions': [
             ['want_separate_host_toolset==1', {
               'toolsets': ['host', 'target'],