gnu: cdogs-sdl: Update to 0.6.7.

* gnu/packages/games.scm (cdogs-sdl): Update to 0.6.7.
[source]: Use version tag.

gnu/packages/games.scm

@@ -3666,21 +3666,18 @@ emerges from a sewer hole and pulls her below ground.")
                      license:cc-by-sa3.0)))))
 
 (define-public cdogs-sdl
-  ;; XXX: Use version 0.6.7 when it's available.
-  (let ((commit "bab2031369b9ea2dbeb7eedbde10a43dd8ca83db")
-        (revision "1"))
   (package
     (name "cdogs-sdl")
-     (version (git-version "0.6.6" revision commit))
+    (version "0.6.7")
     (source (origin
               (method git-fetch)
               (uri (git-reference
                     (url "https://github.com/cxong/cdogs-sdl.git")
-                     (commit commit)))
+                    (commit version)))
               (file-name (git-file-name name version))
               (sha256
                (base32
-                 "09sfqhrrffhvxbhigvrxfmai52w01w3f9kjmixjhqvqlkhn77c9n"))))
+                "1frafzsj3f83xkmn4llr7g728c82lcqi424ini1hv3gv5zjgpa15"))))
     (build-system cmake-build-system)
     (arguments
      `(#:configure-flags
@@ -3705,7 +3702,7 @@ over 100 user-created campaigns.")
                    license:bsd-3
                    license:cc0
                    license:cc-by3.0
-                    license:cc-by-sa3.0)))))
+                   license:cc-by-sa3.0))))
 
 (define-public kiki
   (package