On Alpha and Integrity server systems, creates an extension on
    the current persona. A persona extension is a mechanism to attach
    support for additional security credentials.

    Format

      SYS$PERSONA_CREATE_EXTENSION  persona ,extensionID ,buffer

                                    ,length ,flags

    C Prototype

      int sys$persona_create_extension  (unsigned int *persona,

                                        unsigned int *extensionID,

                                        void *buffer, unsigned

                                        int *length, unsigned int

                                        *flags);