component/python-pim-dm: correctly use cython to build pim-dm

This is needed since version up of pim-dm in cfb05d82

component/python-pim-dm/buildout.cfg

 [buildout]
 extends =
+  ../cython/buildout.cfg
   ../libpcap/buildout.cfg
+  ../macros/macro.pythonpath.eggs.cfg
   ../python-PyYAML/buildout.cfg
 
 parts =
   eggs
 
+# this section is used to pass info from macro pythonpath.eggs to the python-pim-dm section
+[pimdm-env]
+
+[pimdm-pythonpath]
+<= macro.pythonpath.eggs
+environment = pimdm-env
+eggs = ${cython:egg}
+
 [python-pim-dm]
 recipe = zc.recipe.egg:custom
 egg = pim-dm
@@ -15,6 +25,8 @@ library-dirs =
   ${libpcap:location}/lib
 rpath =
   ${libpcap:location}/lib/
+environment = pimdm-env
+depends = ${pimdm-pythonpath:recipe}
 
 [eggs]
 recipe = zc.recipe.egg