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/networking/dnsviz/fix-path.patch

@@ -0,0 +1,18 @@
+diff --git a/dnsviz/config.py.in b/dnsviz/config.py.in
+index 373fde2..007f0f1 100644
+--- a/dnsviz/config.py.in
++++ b/dnsviz/config.py.in
+@@ -26,12 +26,7 @@ from __future__ import unicode_literals
+ import os
+ import sys
+ 
+-_prefix = '__DNSVIZ_INSTALL_PREFIX__'
+-if (hasattr(sys, 'real_prefix') or hasattr(sys, 'base_prefix')) and \
+-        not _prefix:
+-    DNSVIZ_INSTALL_PREFIX = sys.prefix
+-else:
+-    DNSVIZ_INSTALL_PREFIX = _prefix
++DNSVIZ_INSTALL_PREFIX = "@out@"
+ DNSVIZ_SHARE_PATH = os.path.join(DNSVIZ_INSTALL_PREFIX, 'share', 'dnsviz')
+ JQUERY_PATH = __JQUERY_PATH__
+ JQUERY_UI_PATH = __JQUERY_UI_PATH__