Clean up const variable that is no longer necessary
Clean up const variable that is no longer necessary

eklitzke/mysql,siriele/mysql,muthusubbu459/mysql,yyljlyy/mysql,hebihui/mysql,bookerzzz/mysql,springning/mysql,nanata1115/mysql,zhgo/mysql,cw2018/mysql,bookerzzz/mysql,helight/helight_code,jockchou/mysql,rlowe/mysql,cxflag203/mysql,rafaeljusto/mysql,helight/helight_code,helight/helight_code,wfxiang08/mysql,Go-SQL-Driver/MySQL,henrylee2cn/mysql,chinanjjohn2012/mysql,segmentio/mysql,roth1002/mysql,methane/mysql,segmentio/mysql,sunjian1/mysql,tmulchay/mysql,helight/helight_code,eXcomm/gomysql,helight/helight_code,helight/helight_code,hyperworks/mysql,Vorstack/mysql,LightKool/mysql-go,netroby/mysql,helight/helight_code,LightKool/mysql-go,beego/mysql,aperera/mysql,methane/mysql,joshuaprunier/mysql,dalinaum/go-mysql-driver,helight/helight_code,helight/helight_code,Freeaqingme/golang-sql-driver-mysql,yonglehou/mysql,Frca/mysql,VividCortex/mysql,VividCortex/mysql,go-sql-driver/mysql