message: Remove unneeded call to c_str()
diff: @@ -69,7 +69,7 @@ namespace vcpkg::System
  for (auto&& env_wstring : env_wstrings)
  {
  - const optional<std::wstring> value = System::get_environmental_variable(env_wstring.c_str());
  + const optional<std::wstring> value = System::get_environmental_variable(env_wstring);
  auto v = value.get();
  if (!v || v->empty())
  continue;
  