leach 0.3.0

Streamlined FFI and cross-compilation with this powerful build-helper replacement.
Documentation 
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// Copyright (c) 2022-2026 Sprite Tong (<spritetong@gmail.com>)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

//! Inter-dependency metadata communication between build scripts.

use std::env;

/// Emits a metadata field for dependents of this package.
pub fn emit_raw(key: &str, value: &str) {
    println!("cargo:{key}={value}");
}

/// Reads a metadata field from the specified dependency.
pub fn get_raw(dep: &str, key: &str) -> Option<String> {
    let name = format!("DEP_{}_{}", dep.to_uppercase(), key.to_uppercase());
    env::var(&name).ok()
}