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/games/crossfire/crossfire-maps.nix

@@ -0,0 +1,27 @@
+{ stdenv, lib, fetchsvn,
+  version, rev, sha256 }:
+
+stdenv.mkDerivation rec {
+  pname = "crossfire-maps";
+  version = rev;
+
+  src = fetchsvn {
+    url = "http://svn.code.sf.net/p/crossfire/code/maps/trunk/";
+    inherit sha256;
+    rev = "r${rev}";
+  };
+
+  installPhase = ''
+    mkdir -p "$out"
+    cp -a . "$out/"
+  '';
+
+  meta = with lib; {
+    description = "Map data for the Crossfire free MMORPG";
+    homepage = "http://crossfire.real-time.com/";
+    license = licenses.gpl2Plus;
+    platforms = platforms.linux;
+    hydraPlatforms = [];
+    maintainers = with maintainers; [ ToxicFrog ];
+  };
+}