databases/cego: update 2.52.14 -> 2.52.17HEADmain

- Added performance patch to CegoSelect::buildJoinConditions. pPred
  is set to checked if analyzed as complete, also if the predicate
  is external ( setup via setViewCond ) In the meantime, external
  conditions are fully handeled via CegoDistCursor
- In CegoFieldValue::toChain, for case DATETIME resulting string
  was corrected. In the meantime, we avoid date value construction
  via date/scandate function, either the required value is calculated
  via cast. So just the date string value is provided in the defined
  datetime format.
- Added datetime cast operator to convert from string value to
  datetime. If used, this avoids expensive real time cast operations
  for queries and should accelerate execution time

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