remove tests for deprecated Named*Map functions and instead test that the generic variants handle maps
remove tests for deprecated Named*Map functions and instead test that the generic variants handle maps

proteneer/sqlx,cortex/sqlx,aiyi/sqlx,snikch/sqlx,larsth/sqlx,outrightmental/go-sqlx,johnsto/sqlx,jmoiron/sqlx,StabbyCutyou/sqlx,beni55/sqlx,adcaes/sqlx,wmydz1/sqlx