lsof: add one more mirror, the second one seems unavailable (and the original site is too picky about NATs)

pkgs/development/tools/misc/lsof/default.nix

@@ -11,7 +11,13 @@ stdenv.mkDerivation rec {
         # the tarball is moved after new version is released
         isOld: "ftp://sunsite.ualberta.ca/pub/Mirror/lsof/"
         + "${stdenv.lib.optionalString isOld "OLD/"}lsof_${version}.tar.bz2"
-      ) [ false true ];
+      ) [ false true ]
+      ++ map (
+        # the tarball is moved after new version is released
+        isOld: "http://www.mirrorservice.org/sites/lsof.itap.purdue.edu/pub/tools/unix/lsof/"
+        + "${stdenv.lib.optionalString isOld "OLD/"}lsof_${version}.tar.bz2"
+      ) [ false true ]
+      ;
     sha256 = "061p18v0mhzq517791xkjs8a5dfynq1418a1mwxpji69zp2jzb41";
   };