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/python-modules/cryptography/cryptography-py27-warning.patch

@@ -0,0 +1,14 @@
+Delete the warning that breaks tests of dependent projects.
+
+--- a/src/cryptography/__init__.py
++++ b/src/cryptography/__init__.py
+@@ -33,9 +32,0 @@ __all__ = [
+-
+-if sys.version_info[0] == 2:
+-    warnings.warn(
+-        "Python 2 is no longer supported by the Python core team. Support for "
+-        "it is now deprecated in cryptography, and will be removed in the "
+-        "next release.",
+-        CryptographyDeprecationWarning,
+-        stacklevel=2,
+-    )