Rollup merge of #78059 - JohnTitor:fix-linkcheck, r=ehuss

Set `MDBOOK_OUTPUT__HTML__INPUT_404` on linkchecker

This is found in https://github.com/rust-lang/nomicon/pull/240.
It seems the spurious failure shows up without this flag.
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Yuki Okushi 2020-10-18 04:11:15 +09:00 committed by GitHub
commit ffed6af8fd
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@ -34,6 +34,9 @@ then
exit 1
fi
# Avoid failure caused by newer mdbook.
export MDBOOK_OUTPUT__HTML__INPUT_404=""
book_name=""
# Iterative will avoid cleaning up, so you can quickly run it repeatedly.
iterative=0