List lengths are always fixnums now
Without this patch, it was theoretically possible for a list length to be a bignum, which means that safe-length could signal an error (due to generating a too-large bignum) contrary to its documentation. Fix things to remove the theoretical possibility, so that list lengths are always fixnums (and so that list lenghts are always ptrdiff_t values too, since that is assumed internally anyway). * src/alloc.c (Fcons): Do not allocate so many conses that a list length won’t fit into ptrdiff_t or into fixnum. This matters only on weird platforms; on typical platforms, list lengths always fit anyway. * src/fns.c (list_length, Fsafe_length, proper-list-p): Remove integer overflow checks that are no longer needed.
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