ffi: carray type to round out semantics.

The carray type deals with C array passing conventions
as a pointer to the first element of an array of
unknown size. It fills in the functionality gap not
covered by array and varray.

* ffi.c (carray_s): New symbol variable.
(ffi_carray_get, ffi_carray_put): New static functions.
(ffi_type_compile): Handle (carray <type>) syntax.
(struct carray): New struct type.
(carray_struct, carray_struct_checked, carray_print_op,
carray_mark_op, carray_destroy_op): New static functions.
(carray_borrowed_ops, carray_owned_ops): New static structs.
(make_carray, carray_set_length, carray_dup, carray_own,
carray_free, carray_type, length_carray, carray_get,
carray_vec, carray_blank, vec_carray, list_carray, carray_ref,
carray_refset): New functions.
(ffi_init): Initialize carray_s. Register
carray-set_length, carray_dup, carray_own,
carray-free, carray_type, length_carray,
carray-vec, array_blank, vec_carray, list_carray, carray_ref
and carray-refset intrinsics.

* ffi.h (carray_s): Declared.
(make_carray, carray_set_length, carray_dup, carray_own,
carray_free, carray_type, length_carray, carray_get,
carray_vec, carray_blank, vec_carray, list_carray, carray_ref,
carray_refset): Declared.

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