(bitset_alloc, bitset_and_or_, bitset_and_or_cmp_, bitset_andn_or_,
bitset_andn_or_cmp_, bitset_bytes, bitset_copy_, bitset_count_,
bitset_create, bitset_dump, bitset_first, bitset_free, bitset_init,
bitset_last, bitset_next, bitset_obstack_alloc, bitset_obstack_free,
bitset_only_set_p, bitset_op4_cmp, bitset_or_and_, bitset_or_and_cmp_,
bitset_prev, bitset_print, bitset_release_memory, bitset_toggle_,
bitset_type_choose, bitset_type_get, bitset_type_name_get,
debug_bitset): Use function prototypes; this removes the need for
declaring static functions simply to provide their prototypes.