Remove mi_out_data::suppress_output

Remove mi_out_data::suppress_output

The suppress_output field of the mi_ui_out_data structure is never actually
set to 1/true.  We can therefore remove it, and remove all the

  if (suppress_output)

checks.

gdb/ChangeLog:

	* mi/mi-out.c (mi_ui_out_data) <suppress_output>: Remove.
	(mi_table_body): Remove suppress_output check.
	(mi_table_end): Likewise.
	(mi_table_header): Likewise.
	(mi_begin): Likewise.
	(mi_end): Likewise.
	(mi_field_int): Likewise.
	(mi_field_string): Likewise.
	(mi_field_fmt): Likewise.
	(mi_out_data_ctor): Likewise.