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/development/libraries/attr/default.nix

@@ -0,0 +1,33 @@
+{ lib, stdenv, fetchurl, gettext }:
+
+# Note: this package is used for bootstrapping fetchurl, and thus
+# cannot use fetchpatch! All mutable patches (generated by GitHub or
+# cgit) that are needed here should be included directly in Nixpkgs as
+# files.
+
+stdenv.mkDerivation rec {
+  pname = "attr";
+  version = "2.5.1";
+
+  src = fetchurl {
+    url = "mirror://savannah/attr/${pname}-${version}.tar.gz";
+    sha256 = "1y6sibbkrcjygv8naadnsg6xmsqwfh6cwrqk01l0v2i5kfacdqds";
+  };
+
+  outputs = [ "bin" "dev" "out" "man" "doc" ];
+
+  nativeBuildInputs = [ gettext ];
+
+  postPatch = ''
+    for script in install-sh include/install-sh; do
+      patchShebangs $script
+    done
+  '';
+
+  meta = with lib; {
+    homepage = "https://savannah.nongnu.org/projects/attr/";
+    description = "Library and tools for manipulating extended attributes";
+    platforms = platforms.linux;
+    license = licenses.gpl2Plus;
+  };
+}