Rollup merge of #131675 - tdittr:update-unsupported-abi-message, r=compiler-errors

Update lint message for ABI not supported

Tracking issue: #130260

As requested in rust-lang/rust#128784 (review) 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

Author: matthiaskrgr