Only ClearScript's V8 interface uses the Visual C++ libraries, so you don't need them if you're using JScript or VBScript.
Since these libraries are available as free downloads, you can either bundle them with your SDK or instruct your partners to download the latest versions, although they're likely to have them already if they use Visual Studio.
When it comes to end-user deployment, it usually makes sense to have the application package automate the installation of these libraries. See
for an overview of the available options.