take-until: rewrite with seq_info; elide cons.

* lib.c (take_until_list_fun): Renamed to
lazy_take_until_list_fun.
(lazy_take_until_list_fun, take_until): take_until upgraded to
use seq_info to classify sequence. In the lazy list case, the
state cons is elided; the predicate function is passed as the
function environment, and the key function and list being
traversed are propagated via the lazy cons car and cdr.

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