* 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.