No! There's no reason to put that in the HTML when you send a correct header.

You'll only get problems when you change the charset, and you forget to adjust it in both places.

The meta header can only be parsed if the browser already guessed a somewhat compatible encoding, and is an ugly hack for hosting services where you can't influence the header.

But if you're using CGI anyway, you can just as well use the right solution, not an ugly hack.