Rollup merge of #116343 - Nilstrieb:maybe-dont-mention-all-the-weird-lang-items-just-saying, r=bjorn3

Stop mentioning internal lang items in no_std binary errors

When writing a no_std binary, you'll be greeted with nonsensical errors mentioning lang items like eh_personality and start. That's pretty bad because it makes you think that you need to define them somewhere! But oh no, now you're getting the `internal_features` lint telling you that you shouldn't use them! But you need a no_std binary! What now?

No problem! Writing a no_std binary is super easy. Just use panic=abort and supply your own platform specific entrypoint symbol (like `main`) and you're good to go. Would be nice if the compiler told you that, right?

This makes it so that it does do that.

I don't _love_ the new messages yet, but they're decent I think. They can probably be improved, please suggest improvements.

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