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/development/tools/misc/cvise/unifdef.patch

@@ -0,0 +1,8 @@
+--- a/cvise.py
++++ b/cvise.py
+@@ -93,4 +93,5 @@ def find_external_programs():
+     # Special case for clang-format
+     programs['clang-format'] = '@CLANG_FORMAT_PATH@'
++    programs['unifdef'] = '@UNIFDEF@'
+ 
+     return programs