ENH: check for built state for build_egg and build_wininst.
ENH: check for built state for build_egg and build_wininst.

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