gnu: Add go-github.com-ulikunitz-xz.

* gnu/packages/golang.scm (go-github.com-ulikunitz-xz): New variable.

gnu/packages/golang.scm

@@ -6041,3 +6041,25 @@ JSON data to the machine.")
 systems can import this package to enable running programs as services without
 modifying them.")
     (license license:zlib)))
+
+(define-public go-github.com-ulikunitz-xz
+  (package
+    (name "go-github.com-ulikunitz-xz")
+    (version "0.5.8")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://github.com/ulikunitz/xz.git")
+                    (commit (string-append "v" version))))
+              (file-name (string-append name "-" version "-checkout"))
+              (sha256
+               (base32
+                "1xnsymi5fmmm734bi4c6z57p5cvnyxlpi29yxs4v21w5k763aypd"))))
+    (build-system go-build-system)
+    (arguments
+     `(#:import-path "github.com/ulikunitz/xz"))
+    (synopsis "Read and write xz compressed streams in Go")
+    (description "This package provides a library to read and write xz
+compressed streams in Go.")
+    (home-page "https://github.com/ulikunitz/xz")
+    (license license:bsd-3)))