gnu: Add rust-bindgen-0.57.

* gnu/packages/crates-io.scm (rust-bindgen-0.57): New variable.
(rust-bindgen-0.55): Inherit from above.

gnu/packages/crates-io.scm

@@ -3985,8 +3985,45 @@ that uses Serde for transforming structs into bytes and vice versa!")
        (("rust-serde-bytes" ,rust-serde-bytes-0.10)
         ("rust-serde-derive" ,rust-serde-derive-1))))))
 
+(define-public rust-bindgen-0.57
+  (package
+    (name "rust-bindgen")
+    (version "0.57.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "bindgen" version))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32 "0g96ypnck6n60p3cz9k3y3jnxi4z7jfv2pha5bxsm8269806aj7x"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:skip-build? #t
+       #:cargo-inputs
+       (("rust-bitflags" ,rust-bitflags-1)
+        ("rust-cexpr" ,rust-cexpr-0.4)
+        ("rust-clang-sys" ,rust-clang-sys-1)
+        ("rust-clap" ,rust-clap-2)
+        ("rust-env-logger" ,rust-env-logger-0.8)
+        ("rust-lazy-static" ,rust-lazy-static-1)
+        ("rust-lazycell" ,rust-lazycell-1)
+        ("rust-log" ,rust-log-0.4)
+        ("rust-peeking-take-while" ,rust-peeking-take-while-0.1)
+        ("rust-proc-macro2" ,rust-proc-macro2-1)
+        ("rust-quote" ,rust-quote-1)
+        ("rust-regex" ,rust-regex-1)
+        ("rust-rustc-hash" ,rust-rustc-hash-1)
+        ("rust-shlex" ,rust-shlex-0.1)
+        ("rust-which" ,rust-which-3))))
+    (home-page "https://rust-lang.github.io/rust-bindgen/")
+    (synopsis "Generate Rust FFI bindings to C and C++ libraries.")
+    (description "This package can be used to automatically generate Rust FFI
+bindings to C and C++ libraries.")
+    (license license:bsd-3)))
+
 (define-public rust-bindgen-0.55
   (package
+    (inherit rust-bindgen-0.57)
     (name "rust-bindgen")
     (version "0.55.1")
     (source
@@ -3997,7 +4034,6 @@ that uses Serde for transforming structs into bytes and vice versa!")
        (sha256
         (base32
          "0hxlvy9q9984rr3rqaxwmgxjrd9wh11mcc161hv3shz6b7jkrcbm"))))
-    (build-system cargo-build-system)
     (inputs
      `(("clang" ,clang)))
     (arguments
@@ -4027,12 +4063,7 @@ that uses Serde for transforming structs into bytes and vice versa!")
          (add-after 'unpack 'enable-unstable-features
            (lambda _
              (setenv "RUSTC_BOOTSTRAP" "1")
-             #t)))))
+             #t)))))))
-    (home-page "https://rust-lang.github.io/rust-bindgen/")
-    (synopsis "Generate Rust FFI bindings to C and C++ libraries.")
-    (description "This package can be used to automatically generate Rust FFI
-bindings to C and C++ libraries.")
-    (license license:bsd-3)))
 
 (define-public rust-bindgen-0.54
   (package