use Python from buildout.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@44602 20353a03-c40f-0410-a6d1-a30d3c3de9de

buildout/software-profiles/xorg.cfg

@@ -57,6 +57,7 @@ url = http://www.x.org/releases/X11R7.6/src/xcb/xcb-proto-1.6.tar.bz2
 md5sum = 04313e1d914b44d0e457f6c494fc178b
 environment =
   PATH=${libxml2:location}/bin:%(PATH)s
+  PYTHON=${buildout:executable}
 
 [xorg-libpthread-stubs]
 recipe = hexagonit.recipe.cmmi