Auto merge of #23798 - alexcrichton:issue-23781, r=aturon
Previously a panic was generated for recursive prints due to a double-borrow of a `RefCell`. This was solved by the second borrow's output being directed towards the global stdout instead of the per-thread stdout (still experimental functionality). After this functionality was altered, however, recursive prints still deadlocked due to the overridden `write_fmt` method which locked itself first and then wrote all the data. This was fixed by removing the override of the `write_fmt` method. This means that unlocked usage of `write!` on a `Stdout`/`Stderr` may be slower due to acquiring more locks, but it's easy to make more performant with a call to `.lock()`. Closes #23781
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src/test/run-pass/issue-23781.rs
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