* lib/Automake/Variable.pm (@EXPORT): Remove

* lib/Automake/Variable.pm (@EXPORT): Remove
traverse_variable_recursively and
require_variables_for_variable.
(require_variables_for_variable, traverse_variable_recursively)
(_traverse_variable_recursively_worker): Convert to
Automake::Variable methods, remove support for being
invoked with variable names, and rename to ...
(requires_variables, traverse_recursively)
(_do_recursive_traversal): ... these.
(_value_as_list_recursive_worker, transform_variable_recursively):
Update to reflect changes.
* automake.in (handle_LIBOBJS, handle_ALLOCA)
(handle_libraries, handle_ltlibraries, am_primary_prefixes):
Likewise.
(define_objects_from_sources): Fix typo in comment.