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8774: feat: Honor `.cargo/config.toml` r=matklad a=Veykril  Implements `cargo/.config` build target and cfg access by using unstable cargo options: - `cargo config get` to read the target triple out of the config to pass to `cargo metadata` --filter-platform - `cargo rustc --print` to read out the `rustc_cfgs`, this causes us to honor `rustflags` and the like. If those commands fail, due to not having a nightly toolchain present for example, they will fall back to invoking rustc directly as we currently do. I personally think it should be fine to use these unstable options as they are unlikely to change(even if they did it shouldn't be a problem due to the fallback) and don't burden the user if they do not have a nightly toolchain at hand since we fall back to the previous behaviour. cc #8741 Closes #6604, Closes #5904, Closes #8430, Closes #8480 Co-authored-by: Lukas Wirth <lukastw97@gmail.com>
