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/gumath/default.nix

@@ -0,0 +1,47 @@
+{ lib
+, stdenv
+, buildPythonPackage
+, python
+, numba
+, ndtypes
+, xnd
+, libndtypes
+, libxnd
+, libgumath
+, isPy27
+}:
+
+buildPythonPackage {
+  pname = "gumath";
+  disabled = isPy27;
+  inherit (libgumath) src version meta;
+
+  checkInputs = [ numba ];
+  propagatedBuildInputs = [ ndtypes xnd ];
+
+  postPatch = ''
+    substituteInPlace setup.py \
+      --replace 'add_include_dirs = [".", "libgumath", "ndtypes/python/ndtypes", "xnd/python/xnd"] + INCLUDES' \
+                'add_include_dirs = [".", "${libndtypes}/include", "${libxnd}/include", "${libgumath}/include"]' \
+      --replace 'add_library_dirs = ["libgumath", "ndtypes/libndtypes", "xnd/libxnd"] + LIBS' \
+                'add_library_dirs = ["${libndtypes}/lib", "${libxnd}/lib", "${libgumath}/lib"]' \
+      --replace 'add_runtime_library_dirs = ["$ORIGIN"]' \
+                'add_runtime_library_dirs = ["${libndtypes}/lib", "${libxnd}/lib", "${libgumath}/lib"]'
+  '';
+
+  postInstall = lib.optionalString stdenv.isDarwin ''
+    install_name_tool -add_rpath ${libgumath}/lib $out/${python.sitePackages}/gumath/_gumath.*.so
+  '';
+
+  checkPhase = ''
+    pushd python
+    mv gumath _gumath
+    # minor precision issues
+    substituteInPlace test_gumath.py --replace 'test_sin' 'dont_test_sin'
+    python test_gumath.py
+    python test_xndarray.py
+    popd
+  '';
+
+}
+