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/python-magic/default.nix

@@ -0,0 +1,43 @@
+{ lib
+, stdenv
+, python
+, buildPythonPackage
+, fetchFromGitHub
+, substituteAll
+, file
+, pytestCheckHook
+}:
+
+buildPythonPackage rec {
+  pname = "python-magic";
+  version = "0.4.26";
+
+  src = fetchFromGitHub {
+    owner = "ahupp";
+    repo = "python-magic";
+    rev = version;
+    sha256 = "sha256-RcKldMwSRroNZNEl0jwuJG9C+3OIPBzk+CjqkxKK/eY=";
+  };
+
+  patches = [
+    (substituteAll {
+      src = ./libmagic-path.patch;
+      libmagic = "${file}/lib/libmagic${stdenv.hostPlatform.extensions.sharedLibrary}";
+    })
+  ];
+
+  preCheck = ''
+    export LC_ALL=en_US.UTF-8
+  '';
+
+  checkInputs = [
+    pytestCheckHook
+  ];
+
+  meta = with lib; {
+    description = "A python interface to the libmagic file type identification library";
+    homepage = "https://github.com/ahupp/python-magic";
+    license = licenses.mit;
+    maintainers = with maintainers; [ SuperSandro2000 ];
+  };
+}

pkgs/development/python-modules/python-magic/libmagic-path.patch

@@ -0,0 +1,28 @@
+diff --git i/magic/loader.py w/magic/loader.py
+index 931f161..b8096d1 100644
+--- i/magic/loader.py
++++ w/magic/loader.py
+@@ -35,16 +35,12 @@ def _lib_candidates():
+ 
+ 
+ def load_lib():
++  lib = '@libmagic@'
+ 
+-  for lib in _lib_candidates():
+-    # find_library returns None when lib not found
+-    if lib is None:
+-      continue
+-    try:
+-      return ctypes.CDLL(lib)
+-    except OSError:
+-      pass
+-  else:
+-    # It is better to raise an ImportError since we are importing magic module
+-    raise ImportError('failed to find libmagic.  Check your installation')
++  try:
++    return ctypes.CDLL(lib)
++  except OSError:
++    pass
+ 
++  # It is better to raise an ImportError since we are importing magic module
++  raise ImportError('failed to find libmagic.  Check your installation')