BUG: do not load pyext if no extension are to be built.
BUG: do not load pyext if no extension are to be built.

abadger/Bento,cournape/Bento,cournape/Bento,abadger/Bento,cournape/Bento,abadger/Bento,cournape/Bento,abadger/Bento