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/applications/video/vokoscreen/default.nix

@@ -0,0 +1,57 @@
+{ lib, fetchFromGitHub, mkDerivation
+, pkg-config, qtbase, qttools, qmake, qtmultimedia, qtx11extras, alsa-lib, libv4l, libXrandr
+, ffmpeg
+}:
+
+mkDerivation rec {
+
+  pname = "vokoscreen";
+  version = "2.5.8-beta";
+
+  src = fetchFromGitHub {
+    owner   = "vkohaupt";
+    repo    = "vokoscreen";
+    rev     = version;
+    sha256  = "1a85vbsi53mhzva49smqwcs61c51wv3ic410nvb9is9nlsbifwan";
+  };
+
+  nativeBuildInputs = [ pkg-config qmake ];
+  buildInputs = [
+    alsa-lib
+    libv4l
+    qtbase
+    qtmultimedia
+    qttools
+    qtx11extras
+    libXrandr
+  ];
+
+  patches = [
+    ./ffmpeg-out-of-box.patch
+  ];
+
+  # Workaround build failure on -fno-common toolchains:
+  #   ld: alsa_device.o:(.bss+0x8): multiple definition of `rc'; QvkAlsaDevice.o:(.bss+0x8): first defined here
+  NIX_CFLAGS_COMPILE = "-fcommon";
+
+  preConfigure = ''
+    sed -i 's/lrelease-qt5/lrelease/g' vokoscreen.pro
+  '';
+
+  postConfigure = ''
+    substituteInPlace settings/QvkSettings.cpp --subst-var-by ffmpeg ${ffmpeg}
+  '';
+
+  meta = with lib; {
+    description = "Simple GUI screencast recorder, using ffmpeg";
+    homepage = "https://linuxecke.volkoh.de/vokoscreen/vokoscreen.html";
+    longDescription = ''
+      vokoscreen is an easy to use screencast creator to record
+      educational videos, live recordings of browser, installation,
+      videoconferences, etc.
+    '';
+    license = licenses.gpl2Plus;
+    maintainers = [ maintainers.league ];
+    platforms = platforms.linux;
+  };
+}