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/package-management/librepo/default.nix

@@ -0,0 +1,64 @@
+{ lib, stdenv
+, fetchFromGitHub
+, cmake
+, python
+, pkg-config
+, libxml2
+, glib
+, openssl
+, zchunk
+, curl
+, check
+, gpgme
+}:
+
+stdenv.mkDerivation rec {
+  version = "1.14.2";
+  pname = "librepo";
+
+  outputs = [ "out" "dev" "py" ];
+
+  src = fetchFromGitHub {
+    owner = "rpm-software-management";
+    repo = "librepo";
+    rev = version;
+    sha256 = "sha256-KpGbHBgywaXV7r8W5CPS2N1GohdDFiOwAJmrrjS1m5g=";
+  };
+
+  nativeBuildInputs = [
+    cmake
+    pkg-config
+  ];
+
+  buildInputs = [
+    python
+    libxml2
+    glib
+    openssl
+    curl
+    check
+    gpgme
+    zchunk
+  ];
+
+  # librepo/fastestmirror.h includes curl/curl.h, and pkg-config specfile refers to others in here
+  propagatedBuildInputs = [
+    curl
+    gpgme
+    libxml2
+  ];
+
+  cmakeFlags = [ "-DPYTHON_DESIRED=${lib.substring 0 1 python.pythonVersion}" ];
+
+  postFixup = ''
+    moveToOutput "lib/${python.libPrefix}" "$py"
+  '';
+
+  meta = with lib; {
+    description = "Library providing C and Python (libcURL like) API for downloading linux repository metadata and packages";
+    homepage = "https://rpm-software-management.github.io/librepo/";
+    license = licenses.lgpl2Plus;
+    platforms = platforms.linux ++ platforms.darwin;
+    maintainers = with maintainers; [ copumpkin ];
+  };
+}