gnu: Add rust-block-sys-0.1.

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

gnu/packages/crates-io.scm

@@ -8121,6 +8121,28 @@ (define-public rust-block-padding-0.1
      `(#:cargo-inputs
        (("rust-byte-tools" ,rust-byte-tools-0.3))))))
 
+(define-public rust-block-sys-0.1
+  (package
+    (name "rust-block-sys")
+    (version "0.1.0-beta.1")
+    (source (origin
+              (method url-fetch)
+              (uri (crate-uri "block-sys" version))
+              (file-name (string-append name "-" version ".tar.gz"))
+              (sha256
+               (base32
+                "0ihiar08hk0das4q0ii1gsmql975z3rslli1h13jb44hxr0mg98g"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:tests? #f  ; Tests require gcc-objc.
+       #:cargo-inputs
+       (("rust-objc-sys" ,rust-objc-sys-0.2))))
+    (home-page "https://github.com/madsmtm/objc2")
+    (synopsis "Raw bindings to Apple's C language extension of blocks")
+    (description "This package contains raw bindings to Apple's C language
+extension of blocks.")
+    (license license:expat)))
+
 (define-public rust-blocking-1
   (package
     (name "rust-blocking")