Rename crates nix- -> nix-bindings-

This way, the crates can be published without interfering with
potential future non-bindings `nix-` crates, if Nix proper wants to
have native rust code, for instance.

rust/nix-c-raw/build.rs

@@ -1,60 +0,0 @@
-use std::env;
-use std::path::PathBuf;
-
-#[derive(Debug)]
-struct StripNixPrefix {}
-impl bindgen::callbacks::ParseCallbacks for StripNixPrefix {
-    fn item_name(&self, name: &str) -> Option<String> {
-        name.strip_prefix("nix_").map(String::from)
-    }
-}
-
-fn main() {
-    // Tell cargo to invalidate the built crate whenever the wrapper changes
-    println!("cargo:rerun-if-changed=include/nix-c-raw.h");
-    println!("cargo:rustc-link-lib=nixflake");
-
-    // https://rust-lang.github.io/rust-bindgen/library-usage.html
-    let bindings = bindgen::Builder::default()
-        .header("include/nix-c-raw.h")
-        // Find the includes
-        .clang_args(c_headers())
-        // Tell cargo to invalidate the built crate whenever any of the
-        // included header files changed.
-        .parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
-        .parse_callbacks(Box::new(StripNixPrefix {}))
-        // Finish the builder and generate the bindings.
-        .generate()
-        // Unwrap the Result and panic on failure.
-        .expect("Unable to generate bindings");
-
-    // Write the bindings to the $OUT_DIR/bindings.rs file.
-    let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
-    bindings
-        .write_to_file(out_path.join("bindings.rs"))
-        .expect("Couldn't write bindings!");
-}
-
-fn c_headers() -> Vec<String> {
-    let mut args = Vec::new();
-    // args.push("-isystem".to_string());
-    for path in pkg_config::probe_library("nix-flake-c")
-        .unwrap()
-        .include_paths
-        .iter()
-    {
-        args.push(format!("-I{}", path.to_str().unwrap()));
-    }
-
-    for path in pkg_config::probe_library("bdw-gc")
-        .unwrap()
-        .include_paths
-        .iter()
-    {
-        args.push(format!("-I{}", path.to_str().unwrap()));
-    }
-
-    // write to stderr for debugging
-    eprintln!("c_headers: {:?}", args);
-    args
-}