probe_target_info_kind can't use RUSTFLAGS that contain --print

[kornelski]

https://users.rust-lang.org/t/print-native-static-libs/14102

RUSTFLAGS=--print=native-static-libs  cargo build

causes rustc to print extra text, which breaks parsing of its output.

I think filtering out --print* args in fn env_args() would fix this.

[stale]

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[dwijnand]

I think this is fixed with rust-lang/rust#46705.