Enclose the nextBinding()/assert in a CURSOR_LIFECYCLE_ENABLED check to
avoid this assert check unless really needed.
Remove the code instead of having the compiler do this.
merge tjoneslo: Enclose the nextBinding()/assert in a CURSOR_LIFECYCLE_ENABLED check to

Merge pull request #1467 from tjoneslo/sql-layer/operator-cursor-close-use-lifcycle-check
https://github.com/FoundationDB/sql-layer/pull/1467