Add a IO::Path.child(List) candidate
Add a IO::Path.child(List) candidate

For those cases like $?FILE.IO.parent(2).child(<foo bar baz>), so
that we do not encode IO::Spec semantics into strings.

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