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/system/gt5/default.nix

@@ -0,0 +1,27 @@
+{lib, stdenv, fetchurl}:
+
+stdenv.mkDerivation rec {
+  pname = "gt5";
+  version = "1.4.0";
+
+  src = fetchurl {
+    url = "mirror://sourceforge/gt5/gt5-${version}.tar.gz";
+    sha256 = "0gm0gzyp4d9rxqddbaskbz5zvmlhyr4nyb5x9g7x4abyyxqjlnkq";
+  };
+
+  patchPhase = ''
+    sed 's/-o root -g root//' -i Makefile
+  '';
+
+  preConfigure = ''
+    makeFlags="$makeFlags PREFIX=$out"
+  '';
+
+  meta = {
+    description = "A diff-capable 'du' browser";
+    homepage = "http://gt5.sourceforge.net/";
+    license = lib.licenses.gpl2Plus;
+    maintainers = with lib.maintainers; [viric];
+    platforms = with lib.platforms; all;
+  };
+}