* automake.in (&variable_defined, &define_pretty_variable):

* automake.in (&variable_defined, &define_pretty_variable):
Simplify code which used to handle the cases where not all
variables were in %conditional.
(&define_variable): Use &define_pretty_variable.
(&variable_conditions_sub, &variable_value_as_list_worker)
(&variable_value_as_list, &rule_define): Simplify syntax.
(&read_main_am_file): Dump the guilty predefined variables.