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/xjump/darwin.patch

@@ -0,0 +1,21 @@
+--- xjump/src/main.c	2018-02-20 09:15:15.608807657 +0100
++++ xjump-patched/src/main.c	2018-02-20 09:15:34.148949100 +0100
+@@ -604,18 +604,6 @@
+    * optimistic privilege dropping function. */
+   setgroups(0, NULL);
+ 
+-  if (setresgid(-1, realgid, realgid) != 0) {
+-    perror("Could not drop setgid privileges.  Aborting.");
+-    exit(1);
+-  }
+-
+-  /* Dropping user privileges must come last.
+-   * Otherwise we won't be able to drop group privileges anymore */
+-  if (setresuid(-1, realuid, realuid) != 0) {
+-    perror("Could not drop setuid privileges.  Aborting.");
+-    exit(1);
+-  }
+-
+   /* From now on we run with regular user privileges */
+ 
+   static XtActionsRec a_table[] = {

pkgs/games/xjump/default.nix

@@ -0,0 +1,27 @@
+{ lib, stdenv, fetchFromGitHub, autoconf, automake, libX11, libXt, libXpm, libXaw, localStateDir?null }:
+
+stdenv.mkDerivation {
+  pname = "xjump";
+  version = "2.9.3";
+  src = fetchFromGitHub {
+    owner = "hugomg";
+    repo = "xjump";
+    rev = "e7f20fb8c2c456bed70abb046c1a966462192b80";
+    sha256 = "0hq4739cvi5a47pxdc0wwkj2lmlqbf1xigq0v85qs5bq3ixmq2f7";
+  };
+  nativeBuildInputs = [ autoconf automake ];
+  buildInputs = [ libX11 libXt libXpm libXaw ];
+  preConfigure = "autoreconf --install";
+  patches = if stdenv.buildPlatform.isDarwin then [ ./darwin.patch ] else [];
+  configureFlags =
+    if localStateDir != null then
+      ["--localstatedir=${localStateDir}"]
+    else
+      [];
+
+  meta = with lib; {
+    description = "The falling tower game";
+    license = licenses.gpl2;
+    maintainers = with maintainers; [ pmeunier ];
+  };
+}