(FMT_BYTES_ALLOCATED): Now an enum, not a decimal

(FMT_BYTES_ALLOCATED): Now an enum, not a decimal
constant.  Do not assume PRIdMAX etc. are strings of length 3 or
less.
(struct tspec): Use it.  fmt_string is now an array, not
a pointer, as there's little point to the indirection here.
(struct tspec, flag_dump_strings,
traditional, flag_pseudo_start, limit_bytes_to_format,
abbreviate_duplicate_blocks, have_read_stdin, simple_strtoul,
decode_one_format, open_next_file, check_and_close,
decode_format_string, skip, write_block, read_char, read_block,
parse_old_offset, dump, dump_strings, main):
Use bool for booleans.
(struct tspec): Use void *, not char *, for generic pointers.
(bytes_to_oct_digits, bytes_to_signed_dec_digits,
bytes_to_unsigned_dec_digits, bytes_to_hex_digits):
Use char, not unsigned int, since char suffices.
(print_s_char, print_char, print_s_short, print_short,
print_int, print_long, print_long_long, print_float,
print_double, print_long_double): Rewrite to avoid casts.
These now take void * arguments, instead of char *.
Use the same body for all functions, except for the choice
of type.  Assume C89 to simplify handling of signed char.
(dump_hexl_mode_trailer, print_named_ascii, print_ascii):
Rewrite to avoid casts.
(print_named_ascii, print_ascii): Now takes void *, not char *.
(decode_one_format): Use int for printf field widths, not
unsigned int.  Pass void * to subsidiary printers,
not char *.  Simplify handling of floating-point formats
by factoring out common code dealing with precision and field width.
(decode_format_string): Avoid need for temporary copy of
each decoded struct tspec.
(get_lcm): Remove unnecessary cast.
(main): Fix bug where more than INT_MAX failed decodes were ignored.