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/libpcap/default.nix

@@ -0,0 +1,39 @@
+{ lib, stdenv, fetchurl, flex, bison, bluez, pkg-config, withBluez ? false }:
+
+with lib;
+
+stdenv.mkDerivation rec {
+  pname = "libpcap";
+  version = "1.10.1";
+
+  src = fetchurl {
+    url = "https://www.tcpdump.org/release/${pname}-${version}.tar.gz";
+    sha256 = "sha256-7ShfSsyvBTRPkJdXV7Pb/ncrpB0cQBwmSLf6RbcRvdQ=";
+  };
+
+  nativeBuildInputs = [ flex bison ]
+    ++ optionals withBluez [ bluez.dev pkg-config ];
+
+  # We need to force the autodetection because detection doesn't
+  # work in pure build environments.
+  configureFlags = [
+    "--with-pcap=${if stdenv.isLinux then "linux" else "bpf"}"
+  ] ++ optionals stdenv.isDarwin [
+    "--disable-universal"
+  ] ++ optionals (stdenv.hostPlatform == stdenv.buildPlatform)
+    [ "ac_cv_linux_vers=2" ];
+
+  postInstall = ''
+    if [ "$dontDisableStatic" -ne "1" ]; then
+      rm -f $out/lib/libpcap.a
+    fi
+  '';
+
+  meta = {
+    homepage = "https://www.tcpdump.org";
+    description = "Packet Capture Library";
+    platforms = platforms.unix;
+    maintainers = with maintainers; [ fpletz ];
+    license = licenses.bsd3;
+  };
+}