gnu: Add rust-headers-core-0.1.

* gnu/packages/crates-io.scm (rust-headers-core-0.1): New variable.

gnu/packages/crates-io.scm

@@ -11802,6 +11802,27 @@ (define-public rust-hashlink-0.6
 their key-value pairs in a user controllable order.")
     (license (list license:expat license:asl2.0))))
 
+(define-public rust-headers-core-0.1
+  (package
+    (name "rust-headers-core")
+    (version "0.1.1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "headers-core" version))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32 "0ds20kg0igncs2r0jrcf26mq72k3j6ilanr0qwh7r7xak8kk2wcn"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:cargo-inputs
+       (("rust-bytes" ,rust-bytes-0.4)
+        ("rust-http" ,rust-http-0.1))))
+    (home-page "https://hyper.rs")
+    (synopsis "Typed HTTP headers core trait")
+    (description "This package provides typed HTTP headers core trait.")
+    (license license:expat)))
+
 (define-public rust-heapless-0.5
   (package
     (name "rust-heapless")