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/applications/misc/getxbook/default.nix

@@ -0,0 +1,31 @@
+{ lib, stdenv, fetchurl, openssl }:
+
+stdenv.mkDerivation rec {
+  pname = "getxbook";
+  version = "1.2";
+
+  src = fetchurl {
+    url    = "https://njw.me.uk/getxbook/${pname}-${version}.tar.xz";
+    sha256 = "0ihwrx4gspj8l7fc8vxch6dpjrw1lvv9z3c19f0wxnmnxhv1cjvs";
+  };
+
+  NIX_CFLAGS_COMPILE = builtins.toString (
+    [ "-Wno-error=deprecated-declarations" ]
+      ++ lib.optionals (!stdenv.cc.isClang) [
+        "-Wno-error=format-truncation"
+        "-Wno-error=stringop-overflow"
+      ]
+  );
+
+  buildInputs = [ openssl ];
+
+  makeFlags = [ "PREFIX=$(out)" ];
+
+  meta = with lib; {
+    description = "A collection of tools to download books from Google Books";
+    homepage    = "https://njw.me.uk/getxbook/";
+    license     = licenses.isc;
+    maintainers = with maintainers; [ obadz ];
+    platforms   = platforms.all;
+  };
+}