* gdbtypes.h (struct builtin_type): Remove builtin_true_char

	* gdbtypes.h (struct builtin_type): Remove builtin_true_char
	and builtin_true_unsigned_char.
	(builtin_type_true_char): Remove macro, add extern declaration.
	(builtin_type_true_unsigned_char): Add extern declaration.
	* gdbtypes.c (builtin_type_true_char): New global variable.
	(builtin_type_true_unsigned_char): Likewise.
	(_initialize_gdbtypes): Initialize them.
	(gdbtypes_post_init): Do not initialize builtin_true_char
	and builtin_true_unsigned_char members of struct builtin_type.

	* printcmd.c (print_scalar_formatted): Do not use builtin_type;
	use builtin_type_true_unsigned_char instead.

	* ada-valprint.c (ada_val_print_1): Use builtin_type_true_char
	instead of builtin_type_char for internal string.