Automake::Rule: consistently prepend underscore to private variables * lib/Automake/Rule.pm (%suffix_rules): Rename ... (%_suffix_rules): ... like this. (%suffix_rules_builtin): Rename ... (%_suffix_rules_builtin): ... like this. (reset, next_in_suffix_chain, register_suffix_rule, suffix_rules_count): Adjust. Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>