[xerces-c] add netaccessor variant, new version (#19927)
* [xerces-c] add netaccessor variant, new version * [geant4] add xerces-c netaccessor requirement * [xerces-c] format
* [xerces-c] add netaccessor variant, new version * [geant4] add xerces-c netaccessor requirement * [xerces-c] format