uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/tools/misc/entr/default.nix

@@ -0,0 +1,29 @@
+{ lib, stdenv, fetchurl, coreutils }:
+
+stdenv.mkDerivation rec {
+  pname = "entr";
+  version = "5.2";
+
+  src = fetchurl {
+    url = "https://eradman.com/entrproject/code/${pname}-${version}.tar.gz";
+    hash = "sha256-I34wnUawdSEMDky3ib/Qycd37d9sswNBw/49vMZYw4A=";
+  };
+
+  postPatch = ''
+    substituteInPlace entr.c --replace /bin/cat ${coreutils}/bin/cat
+    substituteInPlace entr.1 --replace /bin/cat cat
+  '';
+  dontAddPrefix = true;
+  doCheck = true;
+  checkTarget = "test";
+  installFlags = [ "PREFIX=$(out)" ];
+
+  meta = with lib; {
+    homepage = "https://eradman.com/entrproject/";
+    description = "Run arbitrary commands when files change";
+    changelog = "https://github.com/eradman/entr/raw/${version}/NEWS";
+    license = licenses.isc;
+    platforms = platforms.all;
+    maintainers = with maintainers; [ pSub synthetica ];
+  };
+}