libmikmod: update to version 3.3.7

pkgs/development/libraries/libmikmod/default.nix

···
 { stdenv, fetchurl, texinfo }:
+
 stdenv.mkDerivation rec {
-  name = "libmikmod-3.2.0";
+  name = "libmikmod-3.3.7";
+
   src = fetchurl {
-    url = "http://mikmod.shlomifish.org/files/${name}.tar.gz";
-    sha256 = "07k6iyx6pyzisncgdkd071w2dhm3rx6l34hbja3wbc7rpf888k3k";
+    url = "http://downloads.sourceforge.net/project/mikmod/libmikmod/3.3.7/libmikmod-3.3.7.tar.gz";
+    sha256 = "18nrkf5l50hfg0y50yxr7bvik9f002lhn8c00nbcp6dgm5011x2c";
   };
+
   buildInputs = [ texinfo ];
 
   meta = with stdenv.lib; {