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