Improve quality of tests for time stamp overflow. For example,
without this patch (encode-time 0 0 0 1 1 1152921504606846976) returns the obviously-bogus value (-948597 62170) on my RHEL 5.5 x86-64 host. With it, it reports time overflow. * deps.mk (editfns.o): Depend on ../lib/intprops.h. * editfns.c: Include limits.h and intprops.h. (TIME_T_MIN, TIME_T_MAX): New macros. (time_overflow): Move earlier, to before first use. (hi_time, lo_time): New functions, for an accurate test for out-of-range times. (Fcurrent_time, Fget_internal_run_time, make_time): Use them. (Fget_internal_run_time): Don't assume time_t fits in int. (make_time): Use list2 instead of Fcons twice. (Fdecode_time): More accurate test for out-of-range times. (check_tm_member): New function. (Fencode_time): Use it, to test for out-of-range times.
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