Removed unused DatabaseOperations.date_interval_sql() on Oracle.
Removed unused DatabaseOperations.date_interval_sql() on Oracle.

Unused since 5ca82e710e2f92b8c5114492205c8764918407d3.
treyhunner/django,MarkusH/django,wkschwartz/django,solarissmoke/django,claudep/django,MarkusH/django,frankvdp/django,theo-l/django,koordinates/django,treyhunner/django,shaib/django,claudep/django,charettes/django,django/django,solarissmoke/django,dsanders11/django,reinout/django,MarkusH/django,apollo13/django,georgemarshall/django,ghickman/django,simonw/django,jpic/django,ghickman/django,reinout/django,manhhomienbienthuy/django,pauloxnet/django,googleinterns/django,schinckel/django,charettes/django,wkschwartz/django,felixxm/django,simonw/django,EmadMokhtar/Django,pauloxnet/django,blighj/django,timgraham/django,ghickman/django,felixxm/django,blighj/django,monetate/django,pauloxnet/django,freakboy3742/django,monetate/django,georgemarshall/django,reinout/django,atul-bhouraskar/django,atul-bhouraskar/django,koordinates/django,charettes/django,solarissmoke/django,timgraham/django,adamchainz/django,claudep/django,rsalmaso/django,auvipy/django,treyhunner/django,blighj/django,claudep/django,theo-l/django,simonw/django,adamchainz/django,reinout/django,kaedroho/django,dsanders11/django,atul-bhouraskar/django,jpic/django,shaib/django,felixxm/django,EmadMokhtar/Django,fenginx/django,timgraham/django,googleinterns/django,fenginx/django,fenginx/django,django/django,schinckel/django,freakboy3742/django,monetate/django,kaedroho/django,dsanders11/django,googleinterns/django,rsalmaso/django,koordinates/django,manhhomienbienthuy/django,rsalmaso/django,theo-l/django,EmadMokhtar/Django,koordinates/django,rsalmaso/django,apollo13/django,wkschwartz/django,django/django,frankvdp/django,schinckel/django,kaedroho/django,charettes/django,manhhomienbienthuy/django,timgraham/django,takis/django,solarissmoke/django,auvipy/django,atul-bhouraskar/django,georgemarshall/django,monetate/django,ghickman/django,jpic/django,django/django,shaib/django,auvipy/django,frankvdp/django,elena/django,manhhomienbienthuy/django,pauloxnet/django,apollo13/django,dsanders11/django,takis/django,frankvdp/django,shaib/django,auvipy/django,simonw/django,treyhunner/django,wkschwartz/django,takis/django,adamchainz/django,takis/django,schinckel/django,blighj/django,adamchainz/django,googleinterns/django,felixxm/django,apollo13/django,elena/django,georgemarshall/django,elena/django,elena/django,theo-l/django,fenginx/django,jpic/django,freakboy3742/django,MarkusH/django