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Add `target_env = "p1"` to the `wasm32-wasip1` target
This commit sets the `target_env` key for the
`wasm32-wasi{,p1,p1-threads}` targets to the string `"p1"`. This mirrors how the `wasm32-wasip2` target has `target_env = "p2"`. The intention of this is to more easily detect each target in downstream crates to enable adding custom code per-target.
cc #125803
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rustc_target contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc dev guide.