Add initializer for @*INC and %*CUSTOM_LIB
Add initializer for @*INC and %*CUSTOM_LIB

This takes bare start time of rakudo from 0.210 to 0.175 on my machine

dankogai/rakudo,ab5tract/rakudo,b2gills/rakudo,laben/rakudo,Leont/rakudo,teodozjan/rakudo,zhuomingliang/rakudo,LLFourn/rakudo,sergot/rakudo,cognominal/rakudo,niner/rakudo,skids/rakudo,paultcochrane/rakudo,laben/rakudo,b2gills/rakudo,nunorc/rakudo,ugexe/rakudo,zostay/rakudo,cygx/rakudo,MasterDuke17/rakudo,laben/rakudo,tbrowder/rakudo,softmoth/rakudo,MasterDuke17/rakudo,laben/rakudo,raydiak/rakudo,b2gills/rakudo,paultcochrane/rakudo,tony-o/rakudo,sergot/rakudo,nbrown/rakudo,rakudo/rakudo,azawawi/rakudo,awwaiid/rakudo,Gnouc/rakudo,Gnouc/rakudo,samcv/rakudo,awwaiid/rakudo,nbrown/rakudo,rakudo/rakudo,MasterDuke17/rakudo,retupmoca/rakudo,usev6/rakudo,nunorc/rakudo,zhuomingliang/rakudo,nbrown/rakudo,tony-o/deb-rakudodaily,ugexe/rakudo,labster/rakudo,lucasbuchala/rakudo,salortiz/rakudo,sergot/rakudo,jonathanstowe/rakudo,tony-o/rakudo,sjn/rakudo,teodozjan/rakudo,softmoth/rakudo,tbrowder/rakudo,ugexe/rakudo,skids/rakudo,skids/rakudo,usev6/rakudo,lucasbuchala/rakudo,labster/rakudo,nbrown/rakudo,ugexe/rakudo,zhuomingliang/rakudo,awwaiid/rakudo,raydiak/rakudo,samcv/rakudo,salortiz/rakudo,cygx/rakudo,azawawi/rakudo,skids/rakudo,zhuomingliang/rakudo,jonathanstowe/rakudo,tbrowder/rakudo,tony-o/deb-rakudodaily,tony-o/deb-rakudodaily,b2gills/rakudo,niner/rakudo,MasterDuke17/rakudo,jonathanstowe/rakudo,MasterDuke17/rakudo,Gnouc/rakudo,sjn/rakudo,nbrown/rakudo,azawawi/rakudo,ab5tract/rakudo,tbrowder/rakudo,samcv/rakudo,ungrim97/rakudo,azawawi/rakudo,ugexe/rakudo,dankogai/rakudo,usev6/rakudo,awwaiid/rakudo,cognominal/rakudo,nunorc/rakudo,lucasbuchala/rakudo,retupmoca/rakudo,Leont/rakudo,raydiak/rakudo,Leont/rakudo,labster/rakudo,ab5tract/rakudo,dankogai/rakudo,cognominal/rakudo,tbrowder/rakudo,azawawi/rakudo,cognominal/rakudo,ab5tract/rakudo,samcv/rakudo,teodozjan/rakudo,Gnouc/rakudo,jonathanstowe/rakudo,cognominal/rakudo,retupmoca/rakudo,sjn/rakudo,LLFourn/rakudo,tony-o/rakudo,raydiak/rakudo,tony-o/rakudo,LLFourn/rakudo,cygx/rakudo,rakudo/rakudo,skids/rakudo,softmoth/rakudo,rakudo/rakudo,ungrim97/rakudo,usev6/rakudo,nunorc/rakudo,awwaiid/rakudo,retupmoca/rakudo,ungrim97/rakudo,lucasbuchala/rakudo,softmoth/rakudo,rakudo/rakudo,tony-o/deb-rakudodaily,Leont/rakudo,jonathanstowe/rakudo,nbrown/rakudo,Gnouc/rakudo,niner/rakudo,LLFourn/rakudo,tony-o/deb-rakudodaily,labster/rakudo,cygx/rakudo,salortiz/rakudo,ungrim97/rakudo,tony-o/rakudo,ab5tract/rakudo,cygx/rakudo,b2gills/rakudo,usev6/rakudo,sjn/rakudo,samcv/rakudo,rakudo/rakudo,lucasbuchala/rakudo,salortiz/rakudo,zostay/rakudo,Gnouc/rakudo,zostay/rakudo,zostay/rakudo,labster/rakudo,sjn/rakudo,sergot/rakudo,softmoth/rakudo,paultcochrane/rakudo,tbrowder/rakudo,labster/rakudo,dankogai/rakudo,MasterDuke17/rakudo,teodozjan/rakudo,tony-o/rakudo,salortiz/rakudo,paultcochrane/rakudo,dankogai/rakudo,niner/rakudo,ungrim97/rakudo,tony-o/deb-rakudodaily,paultcochrane/rakudo,LLFourn/rakudo,salortiz/rakudo,tony-o/deb-rakudodaily