clippy: fix extra errors and enforce target-applies-to-host
in xtask
#3497
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This enforces the env variable to set the
--target-applies-to-host
setting when running in xtask. I'm not sure why it's required, but without it, the CI step didn't find all the issues that I could find locally. @jplatte if you have any idea about that, I'd be curious; I've mostly cargo culted the existing workaround used when building the doc. It looks like another instance of rust-lang/cargo#10744 in a slightly different context.The second commit fixes the issues found by clippy.