Change type=settings to type=none for gyp targets

TEST=Compiling Chromium with -Duse_system_v8 no longer prints a GYP warning about "invalid type 'settings'".

Review URL: http://codereview.chromium.org/8256008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9599 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

tools/gyp/v8.gyp

@@ -870,7 +870,7 @@
       'targets': [
         {
           'target_name': 'v8',
-          'type': 'settings',
+          'type': 'none',
           'conditions': [
             ['want_separate_host_toolset==1', {
               'toolsets': ['host', 'target'],