Document that CARGO_PKG_ are availble to build.rs
Document that CARGO_PKG_ are availble to build.rs

rustyhorde/cargo,nipunn1313/cargo,rustyhorde/cargo,eminence/cargo,nipunn1313/cargo,rustyhorde/cargo,rust-lang/cargo,nipunn1313/cargo,rust-lang/cargo,eminence/cargo,rust-lang/cargo,rust-lang/cargo,rustyhorde/cargo,nipunn1313/cargo,eminence/cargo,eminence/cargo