gnu: Add rust-openssl-src.

* gnu/packages/crates-io.scm (rust-openssl-src): New variable.

gnu/packages/crates-io.scm

@@ -2189,6 +2189,28 @@ (define-public rust-openssl-probe
     (license (list license:asl2.0
                    license:expat))))
 
+(define-public rust-openssl-src
+  (package
+    (name "rust-openssl-src")
+    (version "111.6.0+1.1.1d")
+    (source
+      (origin
+        (method url-fetch)
+        (uri (crate-uri "openssl-src" version))
+        (file-name (string-append name "-" version ".tar.gz"))
+        (sha256
+         (base32
+          "172xh95hp7aygahah1940kg1dnx60c5m80cwj5hgi8x7x0fxmhmr"))))
+    (build-system cargo-build-system)
+    (arguments
+      `(#:cargo-inputs (("rust-cc" ,rust-cc))))
+    (home-page "https://github.com/alexcrichton/openssl-src-rs")
+    (synopsis "Source of OpenSSL for rust crates")
+    (description
+     "This package contains the source of OpenSSL and logic to build it.")
+    (license (list license:asl2.0
+                   license:expat))))
+
 (define-public rust-owning-ref
   (package
     (name "rust-owning-ref")