patchelf: Add version (#1540)

* patchelf: Add version

* flake8

* Removed unnecessary url_for_version() function.

* Restored old URL

var/spack/repos/builtin/packages/patchelf/package.py

@@ -30,10 +30,12 @@ class Patchelf(Package):
        ELF executables."""
 
     homepage = "https://nixos.org/patchelf.html"
-    url      = "http://nixos.org/releases/patchelf/patchelf-0.8/patchelf-0.8.tar.gz"
+    url = "http://nixos.org/releases/patchelf/patchelf-0.8/patchelf-0.8.tar.gz"
+
     list_url = "http://nixos.org/releases/patchelf/"
     list_depth = 2
 
+    version('0.9', '3c265508526760f233620f35d79c79fc')
     version('0.8', '407b229e6a681ffb0e2cdd5915cb2d01')
 
     def install(self, spec, prefix):