Update lint message for ABI not supported
Tracking issue: #130260
As requested in https://github.com/rust-lang/rust/pull/128784#pullrequestreview-2364026550 I updated the error message.
I could also change it to be the same message as if it was a hard error on a normal function:
> "`{abi}` is not a supported ABI for the current target"
Or would that get confusing when people try to google the error message?
r? compiler-errors