force pex builder to use a safe pkg_resources
force pex builder to use a safe pkg_resources

VaybhavSharma/commons,ericzundel/commons,WCCCEDU/twitter-commons,abel-von/commons,ericzundel/commons,atollena/commons,abel-von/commons,VaybhavSharma/commons,nkhuyu/commons,WCCCEDU/twitter-commons,brutkin/commons,atollena/commons,pombredanne/commons,pombredanne/commons,brutkin/commons,brutkin/commons,abel-von/commons,WCCCEDU/twitter-commons,Yasumoto/commons,VaybhavSharma/commons,ericzundel/commons,VaybhavSharma/commons,jsirois/commons,cevaris/commons,cevaris/commons,atollena/commons,nkhuyu/commons,Yasumoto/commons,nkhuyu/commons,Yasumoto/commons,cevaris/commons,brutkin/commons,WCCCEDU/twitter-commons,abel-von/commons,brutkin/commons,pombredanne/commons,cevaris/commons,ericzundel/commons,ericzundel/commons,WCCCEDU/twitter-commons,jsirois/commons,Yasumoto/commons,VaybhavSharma/commons,cevaris/commons,atollena/commons,nkhuyu/commons,abel-von/commons,atollena/commons,pombredanne/commons,Yasumoto/commons,nkhuyu/commons,jsirois/commons,jsirois/commons,jsirois/commons,pombredanne/commons