Add missing function CpuFeaturesImpliedByPlatform to OpenBSD platform file

Review URL: http://codereview.chromium.org/465025

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3401 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/platform-openbsd.cc

@@ -83,6 +83,11 @@ void OS::Setup() {
 }
 
 
+uint64_t OS::CpuFeaturesImpliedByPlatform() {
+  return 0;  // OpenBSD runs on anything.
+}
+
+
 double OS::nan_value() {
   return NAN;
 }