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/virtualization/spice-vdagent/default.nix

@@ -0,0 +1,37 @@
+{lib, stdenv, fetchurl, pkg-config, alsa-lib, spice-protocol, glib,
+ libpciaccess, libxcb, libXrandr, libXinerama, libXfixes, dbus, libdrm,
+ systemd}:
+stdenv.mkDerivation rec {
+  pname = "spice-vdagent";
+  version = "0.21.0";
+  src = fetchurl {
+    url = "https://www.spice-space.org/download/releases/${pname}-${version}.tar.bz2";
+    sha256 = "0n8jlc1pv6mkry161y656b1nk9hhhminjq6nymzmmyjl7k95ymzx";
+  };
+
+  # FIXME: May no longer be needed with spice-vdagent versions over 0.21.0
+  NIX_CFLAGS_COMPILE = "-Wno-error=deprecated-declarations";
+
+  postPatch = ''
+    substituteInPlace data/spice-vdagent.desktop --replace /usr $out
+  '';
+  nativeBuildInputs = [ pkg-config ];
+  buildInputs = [ alsa-lib spice-protocol glib libdrm
+                  libpciaccess libxcb libXrandr libXinerama libXfixes
+                  dbus systemd ] ;
+  meta = {
+    description = "Enhanced SPICE integration for linux QEMU guest";
+    longDescription = ''
+       Spice agent for linux guests offering
+       * Client mouse mode
+       * Copy and paste
+       * Automatic adjustment of the X-session resolution
+         to the client resolution
+       * Multiple displays
+    '';
+    homepage = "https://www.spice-space.org/";
+    license = lib.licenses.gpl3Plus;
+    maintainers = [ lib.maintainers.aboseley ];
+    platforms = lib.platforms.linux;
+  };
+}