Remove findutils 4.2.27

We only used this version on Darwin, but the regular findutils seems
to build fine.

pkgs/tools/misc/findutils/4.2.27.nix

@@ -1,14 +0,0 @@
-{stdenv, fetchurl, coreutils}:
-
-stdenv.mkDerivation {
-  name = "findutils-4.2.27";
-  src = fetchurl {
-    url = http://nixos.org/tarballs/findutils-4.2.27.tar.gz;
-    md5 = "f1e0ddf09f28f8102ff3b90f3b5bc920";
-  };
-  buildInputs = [coreutils];
-  patches = [./findutils-path.patch]
-    # Note: the dietlibc is just to get findutils to compile.  The
-    # locate command probably won't work though.
-    ++ (if stdenv ? isDietLibC then [./dietlibc-hack.patch] else []);
-}