gnu: Remove rust-cryptovec-0.4.

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

gnu/packages/crates-io.scm

@@ -15569,34 +15569,6 @@ algorithms.")
 hash functions.")
     (license license:expat)))
 
-(define-public rust-cryptovec-0.4
-  (package
-    (name "rust-cryptovec")
-    (version "0.4.6")
-    (source
-     (origin
-       (method url-fetch)
-       (uri (crate-uri "cryptovec" version))
-       (file-name
-        (string-append name "-" version ".tar.gz"))
-       (sha256
-        (base32
-         "1n88dmhfb2dxs48zllq1g1dya76zx4fajw482qy8jj4hgg1da4p4"))))
-    (build-system cargo-build-system)
-    (arguments
-     `(#:tests? #f  ; CryptoVec::from_slice failed
-       #:cargo-inputs
-       (("rust-kernel32-sys" ,rust-kernel32-sys-0.2)
-        ("rust-libc" ,rust-libc-0.2)
-        ("rust-winapi" ,rust-winapi-0.2))))
-    (home-page "https://crates.io/crates/cryptovec")
-    (synopsis
-     "Vector which zeroes its memory on clears and reallocations")
-    (description
-     "This package provides a vector which zeroes its memory on clears and
-reallocations.")
-    (license license:asl2.0)))
-
 (define-public rust-cssparser-0.28
   (package
     (name "rust-cssparser")