gnu: Remove rust-parity-tokio-ipc-0.4.

* gnu/packages/crates-io.scm (rust-parity-tokio-ipc-0.4): Delete variable.

gnu/packages/crates-io.scm

@@ -40155,36 +40155,6 @@ Concatenating Aggregated Little Endians.")
 derive macro for Parity SCALE Codec.")
     (license license:asl2.0)))
 
-(define-public rust-parity-tokio-ipc-0.4
-  (package
-    (name "rust-parity-tokio-ipc")
-    (version "0.4.0")
-    (source
-     (origin
-       (method url-fetch)
-       (uri (crate-uri "parity-tokio-ipc" version))
-       (file-name (string-append name "-" version ".tar.gz"))
-       (sha256
-        (base32 "1gzifrrpiw78p6dq9ax64vhffc4h6mwg6jazpfgkz8zy0jjzwmqy"))))
-    (build-system cargo-build-system)
-    (arguments
-     `(#:cargo-inputs
-       (("rust-bytes" ,rust-bytes-0.4)
-        ("rust-futures" ,rust-futures-0.1)
-        ("rust-libc" ,rust-libc-0.2)
-        ("rust-log" ,rust-log-0.4)
-        ("rust-mio-named-pipes" ,rust-mio-named-pipes-0.1)
-        ("rust-miow" ,rust-miow-0.3)
-        ("rust-rand" ,rust-rand-0.7)
-        ("rust-tokio" ,rust-tokio-0.1)
-        ("rust-tokio-named-pipes" ,rust-tokio-named-pipes-0.1)
-        ("rust-tokio-uds" ,rust-tokio-uds-0.2)
-        ("rust-winapi" ,rust-winapi-0.3))))
-    (home-page "https://github.com/nikvolf/parity-tokio-ipc")
-    (synopsis "Interprocess communication library for tokio")
-    (description "Interprocess communication library for tokio.")
-    (license (list license:expat license:asl2.0))))
-
 (define-public rust-parity-wasm-0.41
   (package
     (name "rust-parity-wasm")