built-in ro* item in namespace function return not compatible with non-namespaced one

[TwitchBronBron]

Here's a bug:

namespace alpha
    function getDate() as roDateTime
        theDate = createObject("roDateTime")
        return theDate
    end function
end namespace

function toUtcTime(localTime as roDateTime) as roDateTime
    theDate = alpha.getDate()
    return theDate
end function

[markwpearce]

Fixed in #1163