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/misc/screensavers/slock/default.nix

@@ -0,0 +1,39 @@
+{ lib, stdenv, fetchurl, writeText
+, xorgproto, libX11, libXext, libXrandr
+# default header can be obtained from
+# https://git.suckless.org/slock/tree/config.def.h
+, conf ? null }:
+
+with lib;
+stdenv.mkDerivation rec {
+  pname = "slock";
+  version = "1.4";
+
+  src = fetchurl {
+    url = "https://dl.suckless.org/tools/slock-${version}.tar.gz";
+    sha256 = "0sif752303dg33f14k6pgwq2jp1hjyhqv6x4sy3sj281qvdljf5m";
+  };
+
+  buildInputs = [ xorgproto libX11 libXext libXrandr ];
+
+  installFlags = [ "PREFIX=$(out)" ];
+
+  postPatch = "sed -i '/chmod u+s/d' Makefile";
+
+  preBuild = optionalString (conf != null) ''
+    cp ${writeText "config.def.h" conf} config.def.h
+  '';
+
+  makeFlags = [ "CC:=$(CC)" ];
+
+  meta = {
+    homepage = "https://tools.suckless.org/slock";
+    description = "Simple X display locker";
+    longDescription = ''
+      Simple X display locker. This is the simplest X screen locker.
+    '';
+    license = licenses.mit;
+    maintainers = with maintainers; [ astsmtl ];
+    platforms = platforms.linux;
+  };
+}