Fixes transpile issue with global functions

[markwpearce]

Fixes issue where use of global functions in a namespace would cause tranpilier to prefix the functions fixes #1307

Given:

                  namespace is
                        function node(thing) as boolean
                            return invalid <> getInterface(thing, "ifSgNodeChildren")
                        end function
                    end namespace

before would transpile to:

                        function is_node(thing) as boolean
                            return invalid <> is_getInterface(thing, "ifSgNodeChildren")
                        end function

now transpiles to:

                        function is_node(thing) as boolean
                            return invalid <> getInterface(thing, "ifSgNodeChildren")
                        end function