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build.rs: imp. function to show weird paths as hex
* previously char range 0x00 to 0x1F weren't hexified * even if valid utf-8, still show \0 as \x00 (even though in our use case \0 wouldn't be seen due to being converted by Command::arg/args earlier to "<string-with-nul>") * passes the tests that were there thus far but got removed by prev. commit
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