- support changes to js2c in Visual Studio build
  - handle empty handles in Utf8Value
  - add /nologo to sample link in SCons build

TBR=plesner
Review URL: http://codereview.chromium.org/7816

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@538 ce2b1a6d-e550-0410-aec6-3dcde31c8c00