gnu: Add go-github-com-willf-bitset.

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

gnu/packages/golang.scm

@@ -3394,3 +3394,26 @@ (define-public go-github-com-mattn-go-zglob
     (description " A glob library that implements descending into other
 directories.  It is optimized for filewalking. ")
     (license license:expat)))
+
+(define-public go-github-com-willf-bitset
+  (package
+    (name "go-github-com-willf-bitset")
+    (version "1.1.10")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                     (url "https://github.com/willf/bitset")
+                     (commit (string-append "v" version))))
+              (file-name (git-file-name name version))
+              (sha256
+               (base32
+                "0wpaxg6va3qwd0hq0b8rpb1hswvzzbfm2h8sjmcsdpbkydjjx9zg"))))
+    (build-system go-build-system)
+    (arguments
+     '(#:import-path "github.com/willf/bitset"))
+    (synopsis "Bitsets in Go")
+    (description "This package provides a Go implementation of bitsets, which
+are a mapping between non-negative integers and boolean values focused on
+efficient space usage.")
+    (home-page "https://github.com/willf/bitset")
+    (license license:bsd-3)))