pub fn make_target_platform(&self) -> Result<Platform> {
        match &self.target_platform {
            Some(triple) => Ok(Platform::new(triple.to_owned(), TargetFeatures::Unknown)?),
            None => self.guppy_current_platform(),
        }
    }
Returns a `Platform` corresponding to the target platform.
internal-tools/cargo-compare/src/common.rs