gnu: diffstat: Update to 1.61.

* gnu/packages/version-control.scm (diffstat): Update to 1.61.
[source]: Add http://invisible-mirror.net mirror.

gnu/packages/version-control.scm

@@ -919,15 +919,18 @@ standards-compliant ChangeLog entries based on the changes that it detects.")
 (define-public diffstat
   (package
     (name "diffstat")
-    (version "1.58")
+    (version "1.61")
     (source (origin
               (method url-fetch)
-              (uri (string-append
-                    "ftp://invisible-island.net/diffstat/diffstat-"
-                    version ".tgz"))
+              (uri
+               (list
+                 (string-append "ftp://invisible-island.net/diffstat/"
+                                name "-" version ".tgz")
+                 (string-append "http://invisible-mirror.net/archives/diffstat/"
+                                name "-" version ".tgz")))
               (sha256
                (base32
-                "14rpf5c05ff30f6vn6pn6pzy0k4g4is5im656ahsxff3k58i7mgs"))))
+                "1vjmda2zfjxg0qkaj8hfqa8g6bfwnn1ja8696rxrjgqq4w69wd95"))))
     (build-system gnu-build-system)
     (home-page "http://invisible-island.net/diffstat/")
     (synopsis "Make histograms from the output of 'diff'")