gnu: Add go-github-com-templexxx-cpufeat.

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

gnu/packages/syncthing.scm

@@ -1470,3 +1470,27 @@ (define-public go-github-com-kballard-go-shellquote
 using sh's word-splitting rules.")
       (home-page "https://github.com/kballard/go-shellquote")
       (license expat))))
+
+(define-public go-github-com-templexxx-cpufeat
+  (let ((commit "3794dfbfb04749f896b521032f69383f24c3687e")
+        (revision "0"))
+    (package
+      (name "go-github-com-templexxx-cpufeat")
+      (version (git-version "0.0.0" revision commit))
+      (source (origin
+                (method git-fetch)
+                (uri (git-reference
+                       (url "https://github.com/templexxx/cpufeat.git")
+                       (commit commit)))
+                (file-name (git-file-name name version))
+                (sha256
+                 (base32
+                  "0b9f5p6nsiv907rz5d66qzgxnsz4k68r2f45vxi2hwdbnkjfxz8j"))))
+      (build-system go-build-system)
+      (arguments
+       '(#:import-path "github.com/templexxx/cpufeat"))
+      (synopsis "CPU feature identification for Go")
+      (description "This package provides @code{cpu}, which implements
+processor feature detection used by the Go standard libary.")
+      (home-page "https://github.com/templexxx/cpufeat")
+      (license bsd-3))))