gnu: Add rust-memsec-0.5.

* gnu/packages/crates-io.scm (rust-memsec-0.5): New variable.

gnu/packages/crates-io.scm

@@ -12516,6 +12516,30 @@ (define-public rust-memoffset-0.2
          "1cvm2z7dy138s302ii7wlzcxbka5a8yfl5pl5di7lbdnw9hw578g"))))
     (arguments `(#:skip-build? #t))))
 
+(define-public rust-memsec-0.5
+  (package
+    (name "rust-memsec")
+    (version "0.5.7")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "memsec" version))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32 "13ir50j549gdz94pds1i7ljnk14d66q5x91s11hncm1pih7jif8c"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:cargo-inputs
+       (("rust-getrandom" ,rust-getrandom-0.1)
+        ("rust-libc" ,rust-libc-0.2)
+        ("rust-mach-o-sys" ,rust-mach-o-sys-0.1)
+        ("rust-winapi" ,rust-winapi-0.3))))
+    (home-page "https://github.com/quininer/memsec")
+    (synopsis "Rust implementation of libsodium/utils")
+    (description "This package provides a Rust implementation of
+@code{libsodium/utils}.")
+    (license license:expat)))
+
 (define-public rust-metadeps-1.1
   (package
     (name "rust-metadeps")