gdb: Make use of gdb::option framework for some info commands

gdb: Make use of gdb::option framework for some info commands

Update the 'info variables', 'info functions', 'info locals', and
'info args' commands to make use of the gdb::options framework.

There should be no user visible changes after this commit as I have
left the help text generation using the existing mechanism, which
already tries to customise the text for each of the commands.

gdb/ChangeLog:

	* cli/cli-utils.c (extract_info_print_args): Delete.
	(extract_arg_maybe_quoted): Delete.
	(info_print_options_defs): New variable.
	(make_info_print_options_def_group): New function.
	(extract_info_print_options): Define new function.
	* cli/cli-utils.h (extract_info_print_args): Delete.
	(struct info_print_options): New structure.
	(extract_info_print_options): Declare new function.
	* stack.c (info_locals_command): Update to use new
	extract_info_print_options, also add a header comment.
	(info_args_command): Likewise.
	* symtab.c (info_variables_command): Likewise.
	(info_functions_command): Likewise.