const st_option *.
	* libgfortran.h (find_option): Likewise.
	* runtime/environ.c (rounding, precision, signal_choices): Constify.
	(init_choice, show_choice): Change 2nd argument to const choice *.
	* io/open.c (access_opt, action_opt, blank_opt, delim_opt, form_opt,
	position_opt, status_opt, pad_opt): Constify.
	* io/transfer.c (advance_opt): Likewise.
	* io/inquire.c (undefined): Likewise.
	* io/close.c (status_opt): Likewise.
	* io/format.c (posint_required, period_required, nonneg_required,
	unexpected_element, unexpected_end, bad_string, bad_hollerith,
	reversion_error): Likewise.
	* io/unix.c (yes, no, unknown): Change from const char *
	into const char [].


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@104773 138bc75d-0d04-0410-961f-82ee72b054a4