Remove proproitary drivers after first boot.

data/calculate

@@ -81,5 +81,7 @@ stop() {
 	if [[ $roottype == "hdd" ]] && rc-config list boot | grep -q calculate
 	then
 		rc-update del calculate boot
+		local distdir="/usr/portage/distfiles"
+		[[ -d "${distdir}" ]] && [[ -n "`ls ${distdir}`" ]] && rm ${distdir}/*
 	fi
 }