gnu: Remove rust-bytecount-0.5.

* gnu/packages/crates-io.scm (rust-bytecount-0.5): Delete variable.

Change-Id: I612727939d8fb336245eb27aa6cb755d90b025e4

gnu/packages/crates-io.scm

@@ -7909,28 +7909,6 @@ validation framework for Rust.")
 in a byte slice, fast.")
     (license (list license:asl2.0 license:expat))))
 
-(define-public rust-bytecount-0.5
-  (package
-    (inherit rust-bytecount-0.6)
-    (name "rust-bytecount")
-    (version "0.5.1")
-    (source
-     (origin
-       (method url-fetch)
-       (uri (crate-uri "bytecount" version))
-       (file-name
-        (string-append name "-" version ".tar.gz"))
-       (sha256
-        (base32
-         "0z6a280kiy4kg5v3qw97pbyvwycr17fsm41804i8zpq7nmads3xy"))))
-    (arguments
-     `(#:cargo-inputs
-       (("rust-packed-simd" ,rust-packed-simd-0.3))
-       #:cargo-development-inputs
-       (("rust-criterion" ,rust-criterion-0.2)
-        ("rust-quickcheck" ,rust-quickcheck-0.8)
-        ("rust-rand" ,rust-rand-0.6))))))
-
 (define-public rust-bytelines-2
   (package
     (name "rust-bytelines")