findutils: 4.6.0 -> 4.7.0 (#67753)

See https://lists.gnu.org/archive/html/info-gnu/2019-08/msg00009.html
for release information

pkgs/tools/misc/findutils/default.nix

@@ -3,20 +3,16 @@
 }:
 
 stdenv.mkDerivation rec {
-  name = "findutils-4.6.0";
+  pname = "findutils";
+  version = "4.7.0";
 
   src = fetchurl {
-    url = "mirror://gnu/findutils/${name}.tar.gz";
-    sha256 = "178nn4dl7wbcw499czikirnkniwnx36argdnqgz4ik9i6zvwkm6y";
+    url = "mirror://gnu/findutils/${pname}-${version}.tar.xz";
+    sha256 = "16kqz9yz98dasmj70jwf5py7jk558w96w0vgp3zf9xsqk3gzpzn5";
   };
 
   patches = [
-    ./memory-leak.patch
     ./no-install-statedir.patch
-
-    # Prevent tests from failing on old kernels (2.6x)
-    # getdtablesize reports incorrect values if getrlimit() fails
-    ./disable-getdtablesize-test.patch
   ];
 
   buildInputs = [ coreutils ]; # bin/updatedb script needs to call sort