python3Packages.nixpkgs: Fix ImportError with recent pythonix versions

pkgs/development/python-modules/nixpkgs/default.nix

@@ -1,5 +1,6 @@
 { stdenv
 , buildPythonPackage
+, fetchpatch
 , fetchPypi
 , pbr
 , pythonix
@@ -16,6 +17,15 @@ buildPythonPackage rec {
     sha256 = "0gsrd99kkv99jsrh3hckz7ns1zwndi9vvh4465v4gnpz723dd6fj";
   };
 
+  patches = [
+    # Patch should be dropped once https://github.com/t184256/nixpkgs-python-importer/pull/7
+    # is merged and in a release
+    (fetchpatch {
+      url = "https://github.com/adisbladis/nixpkgs-python-importer/commit/749e05f1.patch";
+      sha256 = "1a72phazpqf6vf3hl3m84z9i5n6h1xpa53bqxnpsff6agxxhd21b";
+    })
+  ];
+
   buildInputs = [ pbr ];
   propagatedBuildInputs = [ pythonix ];