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/os-specific/linux/libsemanage/default.nix

@@ -0,0 +1,54 @@
+{ lib, stdenv, fetchurl, pkg-config, bison, flex, libsepol, libselinux, bzip2, audit
+, enablePython ? true, swig ? null, python ? null
+}:
+
+with lib;
+
+stdenv.mkDerivation rec {
+  pname = "libsemanage";
+  version = "3.3";
+  inherit (libsepol) se_url;
+
+  src = fetchurl {
+    url = "${se_url}/${version}/libsemanage-${version}.tar.gz";
+    sha256 = "1s3wb66l47blc15s6lkqs11j9l8pycdqqbb03x3vpfrlz9dfrl44";
+   };
+
+  outputs = [ "out" "dev" "man" ] ++ optional enablePython "py";
+
+  strictDeps = true;
+
+  nativeBuildInputs = [ bison flex pkg-config ] ++ optional enablePython swig;
+  buildInputs = [ libsepol libselinux bzip2 audit ]
+    ++ optional enablePython python;
+
+  makeFlags = [
+    "PREFIX=$(out)"
+    "INCLUDEDIR=$(dev)/include"
+    "MAN3DIR=$(man)/share/man/man3"
+    "MAN5DIR=$(man)/share/man/man5"
+    "PYTHON=python"
+    "PYPREFIX=python"
+    "PYTHONLIBDIR=$(py)/${python.sitePackages}"
+    "DEFAULT_SEMANAGE_CONF_LOCATION=$(out)/etc/selinux/semanage.conf"
+  ];
+
+  # The following turns the 'clobbered' error into a warning
+  # which should fix the following error:
+  #
+  # semanage_store.c: In function 'semanage_exec_prog':
+  # semanage_store.c:1278:6: error: variable 'i' might be clobbered by 'longjmp' or 'vfork' [8;;https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wclobbered-Werror=clobbered8;;]
+  #  1278 |  int i;
+  #       |      ^
+  # cc1: all warnings being treated as errors
+  NIX_CFLAGS_COMPILE = [ "-Wno-error=clobbered" ];
+
+  installTargets = [ "install" ] ++ optionals enablePython [ "install-pywrap" ];
+
+  enableParallelBuilding = true;
+
+  meta = removeAttrs libsepol.meta ["outputsToInstall"] // {
+    description = "Policy management tools for SELinux";
+    license = lib.licenses.lgpl21;
+  };
+}