- some python versions do not have tarfile bug, so check before playing with linking

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@43224 20353a03-c40f-0410-a6d1-a30d3c3de9de

buildout/hooks/postfix-hooks.py

 import os
 def pre_make_hook(options, buildout):
   # workaround python's tarfile bug with links
-  os.symlink('../LICENSE', os.path.join('conf', 'LICENSE'))
-  os.symlink('../TLS_LICENSE', os.path.join('conf', 'TLS_LICENSE'))
+  if not os.path.lexists(os.path.join('conf', 'LICENSE')):
+    os.symlink('../LICENSE', os.path.join('conf', 'LICENSE'))
+  if not os.path.lexists(os.path.join('conf', 'LICENSE')):
+    os.symlink('../TLS_LICENSE', os.path.join('conf', 'TLS_LICENSE'))