* defs.h (ATTR_FORMAT): New macro, expands to gcc's format

* defs.h (ATTR_FORMAT): New macro, expands to gcc's format
  attribute when compiled by gcc.
* defs.h, language.h, monitor.h: Changed many function
  declarations to use ATTR_FORMAT.

* breakpoint.c (delete_command); source.c (directory_command);
  top.c (define_command): Changed call to query() that had too
  many arguments.
* printcmd.c (address_info): Changed call to printf_filtered()
  that had too many arguments.