Remove seemingly dead logging related code from libnetdata. (#17320)

Remove seemingly dead code from libnetdata.

overwrite_thread_source is only accessed in two locations:

- It gets written to only by nd_log_set_thread_source, which does not
  appear to ever be called anywhere in our current code.
- It is only ever read by nd_log_validate_source, which because
  nd_log_set_thread_source is never called should never end up resulting
  in any actual behavioral changes (since it will always be 0).

Based on this, the code is functionally dead, and therefore can safely
be removed.

0 files changed, 0 insertions, 0 deletions