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Add `--print host-tuple` to print host target tuple People often parse `-vV` output to get to the host tuple, which is annoying to do. It's easier to just get it directly. I called it "host-tuple" instead of "host" because it's clearer that it's just the target name. I'm open to different names, but I think this one is fine. a quick GitHub search for `'^host` reveals many instances of people doing the parsing, for example:68e0ca57cd/README.md (L369)0e38473b0c/main.sh (L96)8a3553b865/README.md (L625)43f3ec3970/do.sh (L35)needs a compiler FCP. I could also do an MCP but I think just an FCP here makes the most sense.