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/trezor-udev-rules/default.nix

@@ -0,0 +1,33 @@
+{ lib, stdenv, fetchurl }:
+
+stdenv.mkDerivation rec {
+  pname = "trezor-udev-rules";
+  version = "unstable-2019-07-17";
+
+  udevRules = fetchurl {
+    # let's pin the latest commit in the repo which touched the udev rules file
+    url = "https://raw.githubusercontent.com/trezor/trezor-firmware/68a3094b0a8e36b588b1bcb58c34a2c9eafc0dca/common/udev/51-trezor.rules";
+    sha256 = "0vlxif89nsqpbnbz1vwfgpl1zayzmq87gw1snskn0qns6x2rpczk";
+  };
+
+  dontUnpack = true;
+
+  installPhase = ''
+    cp ${udevRules} 51-trezor.rules
+    mkdir -p $out/lib/udev/rules.d
+    # we use trezord group, not plugdev
+    # we don't need the udev-acl tag
+    substituteInPlace 51-trezor.rules \
+      --replace 'GROUP="plugdev"' 'GROUP="trezord"' \
+      --replace ', TAG+="udev-acl"' ""
+    cp 51-trezor.rules $out/lib/udev/rules.d/51-trezor.rules
+  '';
+
+  meta = with lib; {
+    description = "Udev rules for Trezor";
+    license = licenses.gpl3;
+    maintainers = with maintainers; [ prusnak ];
+    platforms = platforms.linux;
+    homepage = "https://github.com/trezor/trezor-firmware/tree/master/common/udev";
+  };
+}