databases/cego: update 2.49.21 -> 2.49.22

- For several modules, added exception trace information to improve
  error logging in case of any exception
- Patch added for CegoQueryCache::addEntry, getNumUsed added to
  search loop to find appropriate slot. This avoids some needless
  assignments, since used entries cannot be assigned.
- Patch added CegoQueryCache::invalidate. For main loop, a delay
  has been added, to give other threads the chance to claim the lock