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/misc/fluent-bit/default.nix

@@ -0,0 +1,38 @@
+{ lib, stdenv, fetchFromGitHub, cmake, flex, bison, systemd, openssl }:
+
+stdenv.mkDerivation rec {
+  pname = "fluent-bit";
+  version = "1.9.3";
+
+  src = fetchFromGitHub {
+    owner = "fluent";
+    repo = "fluent-bit";
+    rev = "v${version}";
+    sha256 = "sha256-CMkVIWaD4Zt6SJ/4PLGrFDhirqeLbXcVa+96wsAYN/k=";
+  };
+
+  nativeBuildInputs = [ cmake flex bison ];
+
+  buildInputs = [ openssl ]
+    ++ lib.optionals stdenv.isLinux [ systemd ];
+
+  cmakeFlags = [ "-DFLB_METRICS=ON" "-DFLB_HTTP_SERVER=ON" ];
+
+  # _FORTIFY_SOURCE requires compiling with optimization (-O)
+  NIX_CFLAGS_COMPILE = lib.optionalString stdenv.cc.isGNU "-O";
+
+  outputs = [ "out" "dev" ];
+
+  postPatch = ''
+    substituteInPlace src/CMakeLists.txt \
+      --replace /lib/systemd $out/lib/systemd
+  '';
+
+  meta = with lib; {
+    description = "Log forwarder and processor, part of Fluentd ecosystem";
+    homepage = "https://fluentbit.io";
+    maintainers = with maintainers; [ samrose fpletz ];
+    license = licenses.asl20;
+    platforms = platforms.unix;
+  };
+}