HPCC-9394 Remove unsafe (but unused) code in ccdfile.cpp

Some code left over from refactoring that was done for initial OSS release.

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #4426 from richardkchapman/roxie-dead-code

HPCC-9394 Remove unsafe (but unused) code in ccdfile.cpp

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>