pythonPackages.hdbscan: fix build by removing upstream patch, adding joblib

joblib is for the benefit of py27, whose scikitlearn doesn't include it.
also move cython to nativeBuildInputs

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

@@ -6,7 +6,7 @@
 , scipy
 , scikitlearn
 , fetchPypi
-, fetchpatch
+, joblib
 }:
 
 buildPythonPackage rec {
@@ -18,18 +18,10 @@ buildPythonPackage rec {
     sha256 = "5cfdc25375123eb9a72363449979141cc928c1953f220f0f81d7baabcaccec2d";
   };
 
-  patches = [
-    # Fix Tests. Drop in release >0.8.20
-    (fetchpatch {
-      name = "test-rsl-missing-import.patch";
-      url = https://github.com/scikit-learn-contrib/hdbscan/commit/e40ccef139e56e38adf7bd6912cd63efd97598f9.patch;
-      sha256 = "0cfq4ja7j61h2zwd1jw5gagcz2sg18kjnx29sb0bwa13wfw6fip0";
-    })
-  ];
-
   checkInputs = [ nose ];
 
-  propagatedBuildInputs = [ cython numpy scipy scikitlearn ];
+  nativeBuildInputs = [ cython ];
+  propagatedBuildInputs = [ numpy scipy scikitlearn joblib ];
 
   meta = with lib; {
     description = "Hierarchical Density-Based Spatial Clustering of Applications with Noise, a clustering algorithm with a scikit-learn compatible API";