Move fetching of constants to setting build time
Move fetching of constants to setting build time

- two less things to do at every startup
- two less checks when doing an "unival"

salortiz/rakudo,tbrowder/rakudo,labster/rakudo,rakudo/rakudo,tony-o/rakudo,MasterDuke17/rakudo,tbrowder/rakudo,MasterDuke17/rakudo,salortiz/rakudo,salortiz/rakudo,MasterDuke17/rakudo,rakudo/rakudo,tony-o/rakudo,rakudo/rakudo,tony-o/rakudo,labster/rakudo,tony-o/rakudo,labster/rakudo,rakudo/rakudo,tony-o/rakudo,labster/rakudo,tony-o/rakudo,salortiz/rakudo,MasterDuke17/rakudo,rakudo/rakudo,MasterDuke17/rakudo,rakudo/rakudo,MasterDuke17/rakudo,tbrowder/rakudo,tbrowder/rakudo,salortiz/rakudo,salortiz/rakudo,labster/rakudo,tbrowder/rakudo,tbrowder/rakudo,labster/rakudo