- remove useless pragma, use only  include guards
- remove useless pragma, use only  include guards

EricKTCheung/davix,EricKTCheung/davix,EricKTCheung/davix,cern-it-sdc-id/davix,cern-it-sdc-id/davix,EricKTCheung/davix,cern-it-sdc-id/davix,cern-it-sdc-id/davix