gnu: Add go-github-com-golang-snappy.

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

gnu/packages/syncthing.scm

@@ -283,3 +283,27 @@ mechanism with caching and de-duplication that works across a set of peer
 processes.")
       (home-page "https://github.com/golang/groupcache")
       (license asl2.0))))
+
+(define-public go-github-com-golang-snappy
+  (let ((commit "553a641470496b2327abcac10b36396bd98e45c9")
+        (revision "0"))
+    (package
+      (name "go-github-com-golang-snappy")
+      (version (git-version "0.0.0" revision commit))
+      (source (origin
+                (method git-fetch)
+                (uri (git-reference
+                      (url "https://github.com/golang/snappy")
+                      (commit commit)))
+                (file-name (git-file-name name version))
+                (sha256
+                 (base32
+                  "0kssxnih1l722hx9219c7javganjqkqhvl3i0hp0hif6xm6chvqk"))))
+      (build-system go-build-system)
+      (arguments
+       `(#:import-path "github.com/golang/snappy"))
+      (synopsis "Snappy compression format in the Go programming language")
+      (description "This package provides a Go implementation of the Snappy
+compression format.")
+      (home-page "https://github.com/golang/snappy")
+      (license bsd-3))))