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/tools/backup/duplicity/gnutar-in-test.patch

@@ -0,0 +1,20 @@
+diff --git a/testing/functional/test_restart.py b/testing/functional/test_restart.py
+index 6d972c82..e8435fd5 100644
+--- a/testing/functional/test_restart.py
++++ b/testing/functional/test_restart.py
+@@ -350,14 +350,7 @@ class RestartTestWithoutEncryption(RestartTest):
+         https://launchpad.net/bugs/929067
+         """
+ 
+-        if platform.system().startswith(u'Linux'):
+-            tarcmd = u"tar"
+-        elif platform.system().startswith(u'Darwin'):
+-            tarcmd = u"gtar"
+-        elif platform.system().endswith(u'BSD'):
+-            tarcmd = u"gtar"
+-        else:
+-            raise Exception(u"Platform %s not supported by tar/gtar." % platform.platform())
++        tarcmd = u"tar"
+ 
+         # Intial normal backup
+         self.backup(u"full", u"{0}/testfiles/blocktartest".format(_runtest_dir))