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/srtp/default.nix

@@ -0,0 +1,57 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, libpcap
+, meson
+, ninja
+, openssl
+, pkg-config
+}:
+
+stdenv.mkDerivation rec {
+  pname = "libsrtp";
+  version = "2.4.2";
+
+  src = fetchFromGitHub {
+    owner = "cisco";
+    repo = "libsrtp";
+    rev = "v${version}";
+    sha256 = "sha256-6FAkfxC7Tg7uIAmTmRt5Sn8/YofILfpe7Y4pSaq8XL8=";
+  };
+
+  outputs = [ "out" "dev" ];
+
+  nativeBuildInputs = [
+    meson
+    ninja
+    pkg-config
+  ];
+
+  buildInputs = [
+    libpcap
+    openssl
+  ];
+
+  # rtpw tests hang
+  preConfigure = ''
+    rm test/rtpw_test.sh \
+       test/rtpw_test_gcm.sh
+  '';
+
+  mesonFlags = [
+    "-Dcrypto-library=openssl"
+    "-Dcrypto-library-kdf=disabled"
+    "-Ddoc=disabled"
+    "-Dtests=${if doCheck then "enabled" else "disabled"}"
+  ];
+
+  doCheck = true;
+
+  meta = with lib; {
+    homepage = "https://github.com/cisco/libsrtp";
+    description = "Secure RTP (SRTP) Reference Implementation";
+    license = licenses.bsd3;
+    platforms = platforms.all;
+    maintainers = with maintainers; [ r-burns ];
+  };
+}