Auto merge of #145086 - jdonszelmann:revert-allow-internal-unsafe, r=Kobzol

Revert "Port `#[allow_internal_unsafe]` to the new attribute system"

This reverts commit 4f7a6ace9e2f2192af7b5d32f4b1664189e0e143 (PR: rust-lang/rust#144857)

r? `@Kobzol`
cc: `@scrabsha`

clean revert it seems :3

Author: bors