Remove dead CPP code from persistent-sqlite.
Remove dead CPP code from persistent-sqlite.

psibi/persistent,andrewthad/persistent,mitchellwrosen/persistent,jasonzoladz/persistent,mkscrg/persistent,gbwey/persistent,erikd/persistent,mkscrg/persistent,meteficha/persistent,mitchellwrosen/persistent,gbwey/persistent,superduper/persistent,jcristovao/persistent,jcristovao/persistent,jasonzoladz/persistent,bitemyapp/persistent,meteficha/persistent,meteficha/persistent,rdnetto/persistent,nakaji-dayo/persistent,plow-technologies/persistent,yesodweb/persistent,jasonzoladz/persistent,pseudonom/persistent,junjihashimoto/persistent,greydot/persistent,superduper/persistent,gbwey/persistentold,naushadh/persistent,pseudonom/persistent,superduper/persistent,nakaji-dayo/persistent,rdnetto/persistent,andrewthad/persistent,gbwey/persistent,jcristovao/persistent,mkscrg/persistent,andrewthad/persistent,nakaji-dayo/persistent,gbwey/persistentold,creichert/persistent,junjihashimoto/persistent,mitchellwrosen/persistent,greydot/persistent,greydot/persistent,paul-rouse/persistent