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/os-specific/linux/uvcdynctrl/default.nix

@@ -0,0 +1,37 @@
+{ lib, stdenv, fetchFromGitHub, cmake, pkg-config, libxml2 }:
+
+stdenv.mkDerivation {
+  version = "0.3.0";
+  pname = "uvcdynctrl";
+
+  src = fetchFromGitHub {
+    owner = "cshorler";
+    repo = "webcam-tools";
+    rev = "bee2ef3c9e350fd859f08cd0e6745871e5f55cb9";
+    sha256 = "0s15xxgdx8lnka7vi8llbf6b0j4rhbjl6yp0qxaihysf890xj73s";
+  };
+
+  nativeBuildInputs = [ cmake pkg-config ];
+  buildInputs = [ libxml2 ];
+
+  prePatch = ''
+    local fixup_list=(
+      uvcdynctrl/CMakeLists.txt
+      uvcdynctrl/udev/rules/80-uvcdynctrl.rules
+      uvcdynctrl/udev/scripts/uvcdynctrl
+    )
+    for f in "''${fixup_list[@]}"; do
+      substituteInPlace "$f" \
+        --replace "/etc/udev" "$out/etc/udev" \
+        --replace "/lib/udev" "$out/lib/udev"
+    done
+  '';
+
+  meta = with lib; {
+    description = "A simple interface for devices supported by the linux UVC driver";
+    homepage = "http://guvcview.sourceforge.net";
+    license = licenses.gpl3Plus;
+    maintainers = [ maintainers.puffnfresh ];
+    platforms = platforms.linux;
+  };
+}