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/libiscsi/default.nix

@@ -0,0 +1,27 @@
+{ lib, stdenv, fetchFromGitHub, autoreconfHook }:
+
+stdenv.mkDerivation rec {
+  pname = "libiscsi";
+  version = "1.19.0";
+
+  src = fetchFromGitHub {
+    owner = "sahlberg";
+    repo = "libiscsi";
+    rev = version;
+    sha256 = "0ajrkkg5awmi8m4b3mha7h07ylg18k252qprvk1sgq0qbyd66zy7";
+  };
+
+  nativeBuildInputs = [ autoreconfHook ];
+
+  # This problem is gone on libiscsi master.
+  NIX_CFLAGS_COMPILE =
+    lib.optional stdenv.hostPlatform.is32bit "-Wno-error=sign-compare";
+
+  meta = with lib; {
+    description = "iscsi client library and utilities";
+    homepage = "https://github.com/sahlberg/libiscsi";
+    license = licenses.lgpl2;
+    platforms = platforms.unix;
+    maintainers = with maintainers; [ misuzu ];
+  };
+}