Give an error message if LibreSSL's TLSv1.3 APIs aren't what we need

From LibreSSL versions 3.2.1 through 3.4.0, our configure script
would conclude that TLSv1.3 as supported, but it actually wasn't.
This led to annoying breakage like #40128 and #40445.

Now we give an error message if we try to build with one of those
versions.

Closes #40511.