gnu: Add rust-nix-0.19.

* gnu/packages/crates-io.scm (rust-nix-0.19): New variable.
(rust-nix-0.17): Inherit from above.

gnu/packages/crates-io.scm

@@ -17482,22 +17482,55 @@ cryptographic library.")
 release (fork of debug_unreachable)")
     (license license:expat)))
 
+(define-public rust-nix-0.19
+  (package
+    (name "rust-nix")
+    (version "0.19.1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "nix" version))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32 "1wk1pmaf9pv84sc4jf19gm1as2yq3ydwcx0n5nc1bpsgzq6bmk5j"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:tests? #f                      ; test suite hangs
+       #:cargo-inputs
+       (("rust-bitflags" ,rust-bitflags-1)
+        ("rust-cc" ,rust-cc-1)
+        ("rust-cfg-if" ,rust-cfg-if-1)
+        ("rust-libc" ,rust-libc-0.2))
+       #:cargo-development-inputs
+       (("rust-bytes" ,rust-bytes-0.4)
+        ("rust-caps" ,rust-caps-0.3)
+        ("rust-lazy-static" ,rust-lazy-static-1)
+        ("rust-rand" ,rust-rand-0.6)
+        ("rust-semver" ,rust-semver-0.9)
+        ("rust-sysctl" ,rust-sysctl-0.1)
+        ("rust-tempfile" ,rust-tempfile-3))))
+    (home-page "https://github.com/nix-rust/nix")
+    (synopsis "Rust friendly bindings to *nix APIs")
+    (description
+     "Nix seeks to provide friendly bindings to various *nix platform APIs.
+The goal is to not provide a 100% unified interface, but to unify what can be
+while still providing platform specific APIs.")
+    (license license:expat)))
+
 (define-public rust-nix-0.17
   (package
+    (inherit rust-nix-0.19)
     (name "rust-nix")
     (version "0.17.0")
     (source
      (origin
        (method url-fetch)
        (uri (crate-uri "nix" version))
-       (file-name
+       (file-name (string-append name "-" version ".tar.gz"))
-        (string-append name "-" version ".tar.gz"))
        (sha256
-        (base32
+        (base32 "0qvk09kib3jpvpbaps0682nav20ibql61pf1s2h8jx9v5igpir2h"))))
-         "0qvk09kib3jpvpbaps0682nav20ibql61pf1s2h8jx9v5igpir2h"))))
-    (build-system cargo-build-system)
     (arguments
-     `(#:tests? #f      ; test suite hangs
+     `(#:tests? #f                      ; test suite hangs
        #:cargo-inputs
        (("rust-bitflags" ,rust-bitflags-1)
         ("rust-cc" ,rust-cc-1)
@@ -17510,11 +17543,7 @@ release (fork of debug_unreachable)")
         ("rust-lazy-static" ,rust-lazy-static-1)
         ("rust-rand" ,rust-rand-0.6)
         ("rust-sysctl" ,rust-sysctl-0.1)
-        ("rust-tempfile" ,rust-tempfile-3))))
+        ("rust-tempfile" ,rust-tempfile-3))))))
-    (home-page "https://github.com/nix-rust/nix")
-    (synopsis "Rust friendly bindings to *nix APIs")
-    (description "Rust friendly bindings to *nix APIs.")
-    (license license:expat)))
 
 (define-public rust-nix-0.15
   (package