Port to C89.

Port to C89.

* data.c (arithcompare_driver):
* fileio.c (Fcar_less_than_car):
* fns.c (internal_equal):
* frame.c (delete_frame):
* lisp.h (enum More_Lisp_Bits):
* lread.c (read1):
Avoid C99 constructs that don't work in C89.
* data.c (ULL_MAX, count_trailing_zeros_ll): New macros,
to port to C89, which doesn't have 'long long'.
(count_trailing_zero_bits): Use them.