* symfile.c (symbol_file_add_main_1): Use inferior's

	* symfile.c (symbol_file_add_main_1): Use inferior's
	symfile_flags.
	* solib.c (solib_read_symbols): Use inferior's symfile_flags.
	* linux-nat.c (linux_child_follow_fork): Set symfile_flags on
	inferior.
	* infrun.c (handle_vfork_child_exec_or_exit): Set symfile_flags on
	inferior.
	(follow_exec): Use inferior's symfile_flags.
	* inferior.h (struct inferior) <symfile_flags>: New field.