[sv-bc] Optional parenthesis on task_prototype etc

Based on existing code in the OVA:

  extern virtual function string convert2string;

I believe the following in appendix A:

  task_prototype ::=
        TASK task_identifier '(' [ tf_port_list ] ')'
  function_prototype ::=
        FUNCTION data_type_or_void function_identifier '(' [ tf_port_list ] ')'
  class_constructor_prototype ::=
        FUNCTION NEW '(' [ tf_port_list ] ')' ';'

should be:

  task_prototype ::=
        TASK task_identifier [ '(' [ tf_port_list ] ')' ]
  function_prototype ::=
        FUNCTION data_type_or_void function_identifier [ '(' [ tf_port_list ] ')' ]
  class_constructor_prototype ::=
        FUNCTION NEW [ '(' [ tf_port_list ] ')' ] ';'

IE the parenthesis should be optional to match how non-prototypes can
already be declared.

Thanks

-Wilson

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