use -Zroot-dir instead of --remap-path-prefix for diagnostic dir handling #4039
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A while ago we started setting
--remap-path-prefixso that./miri checkwould show all error messages relative to the Miri dir, rather than relative to the folder of the respective crate. Now cargo has-Zroot-dirwhich is more directly targeting this usecase, and which will hopefully soon be used by rustc for the same purpose. So let's use it in Miri as well. I checked locally that this works for both miri-script and cargo-miri.