Even though the compiler was usually able to compile them into
_something_, the code was likely incorrect in all cases. To prevent
users from tripping up on that the compiler will return an error if it
encounters type params until
gopherjs#1013 is resolved.

Go 1.18 upstream includes the fix, which makes the overlay unnecessary.

This mirrors the change in the upstream.

Upstream already skips it for wasm, so it should be ok for us to skip it
as well.

GopherJS doesn't have the problem it targets, but its println() format
is different from upstream Go, which causes the test failure.