usr(build-artifacts): remove some things that portage automatically creates
usr(build-artifacts): remove some things that portage automatically creates

sigma/coreos-scripts,fivethreeo/scripts,marineam/coreos-scripts,sigma/coreos-scripts,vmware/coreos-scripts,marineam/coreos-scripts,coreos/scripts,smilart/scripts,BugRoger/scripts,gtank/scripts,crawford/scripts,glevand/coreos--scripts,coreos/scripts,bcwaldon/coreos-scripts,andrejro/coreos--scripts,mischief/scripts,zhang0137/scripts,zhang0137/scripts,gtank/scripts,bcwaldon/coreos-scripts,endocode/scripts,BugRoger/scripts,mjg59/scripts,smilart/scripts,mischief/scripts,mjg59/scripts,trnubo/scripts,fivethreeo/scripts,nicescale/scripts,crawford/scripts,smilart/scripts,nicescale/scripts,vmware/coreos-scripts,zhang0137/scripts,endocode/scripts,glevand/coreos--scripts,gtank/scripts,andrejro/coreos--scripts,fivethreeo/scripts,vmware/coreos-scripts,sigma/coreos-scripts,trnubo/scripts,crawford/scripts,andrejro/coreos--scripts,nicescale/scripts,marineam/coreos-scripts,endocode/scripts,trnubo/scripts,mjg59/scripts,BugRoger/scripts,bcwaldon/coreos-scripts,mischief/scripts