(lbitset_bytes): Adjust to new, unique names for structures.
(lbitset_and, lbitset_and_cmp, lbitset_andn, lbitset_andn_cmp,
lbitset_or, lbitset_or_cmp, lbitset_xor, lbitset_xor_cmp,
lbitset_empty_p, lbitset_ones, lbitset_not, lbitset_subset_p,
lbitset_disjoint_p, debug_lbitset): Supply prototype decls.
(enum_lbitset_find_mode): New type. All instances of parameters of
type enum FOO are now of type enum_FOO, to conform to the C Standard.
(struct lbitset_struct, lbitset, bitset_struct, PFV): Remove.
(lbitset_and, lbitset_andn, lbitset_or, lbitset_xor): New functions.
Use bitset_bindex, not int or unsigned int or size_t, to count bits.
(lbitset_bytes): Use size_t, not unsigned int, to count bytes.
Use proper printf formats for widths of integer types.
(lbitset_ones, lbitset_not): Use bitset_windex instead of unsigned int.
(lbitset_elt_find): Simplify windex calculation and avoid cast to unsigned.
