use cmd_sfunc_ftype and cmd_cfunc_ftype more

use cmd_sfunc_ftype and cmd_cfunc_ftype more

This patch changes a few more spots to use either cmd_sfunc_ftype or
cmd_cfunc_ftype, as appropriate.  This is a bit cleaner.

Tested by rebuilding.

2014-07-01  Tom Tromey  <tromey@redhat.com>

	* breakpoint.c (add_catch_command): Use cmd_sfunc_ftype.
	* breakpoint.h (add_catch_command): Use cmd_sfunc_ftype.
	* cli/cli-decode.c (cmd_cfunc_eq, add_cmd, add_prefix_cmd)
	(add_abbrev_prefix_cmd, add_info, add_com): Use cmd_cfunc_ftype.
	* command.h (cmd_cfunc_ftype): Move earlier.
	(add_cmd, add_prefix_cmd, add_abbrev_prefix_cmd, cmd_cfunc_eq)
	(add_com, add_info): Use cmd_cfunc_ftype.