Makefile: remove obsolete `varcheck` exemption
Makefile: remove obsolete `varcheck` exemption

paperstreet/cockroach,veteranlu/cockroach,cockroachdb/cockroach,cockroachdb/cockroach,glycerine/cockroach,maxlang/cockroach,paperstreet/cockroach,nieyy/cockroach,paperstreet/cockroach,cuongdo/cockroach,cuongdo/cockroach,bg451/cockroach,arjun4084346/cockroach,glycerine/cockroach,il9ue/cockroach,nieyy/cockroach,sunya123/cockroach,vivekmenezes/cockroach,marcuswestin/cockroach,bg451/cockroach,sunya123/cockroach,arjun4084346/cockroach,arjun4084346/cockroach,vaibhavarora/cockroach,glycerine/cockroach,paperstreet/cockroach,sunya123/cockroach,bg451/cockroach,cuongdo/cockroach,petermattis/cockroach,veteranlu/cockroach,marcuswestin/cockroach,vivekmenezes/cockroach,cockroachdb/cockroach,glycerine/cockroach,glycerine/cockroach,paperstreet/cockroach,vaibhavarora/cockroach,cockroachdb/cockroach,maxlang/cockroach,maxlang/cockroach,petermattis/cockroach,paperstreet/cockroach,cuongdo/cockroach,vivekmenezes/cockroach,cockroachdb/cockroach,marcuswestin/cockroach,il9ue/cockroach,maxlang/cockroach,il9ue/cockroach,sunya123/cockroach,paperstreet/cockroach,arjun4084346/cockroach,veteranlu/cockroach,il9ue/cockroach,marcuswestin/cockroach,marcuswestin/cockroach,marcuswestin/cockroach,petermattis/cockroach,sunya123/cockroach,petermattis/cockroach,bg451/cockroach,marcuswestin/cockroach,glycerine/cockroach,vaibhavarora/cockroach,petermattis/cockroach,nieyy/cockroach,bg451/cockroach,maxlang/cockroach,nieyy/cockroach,veteranlu/cockroach,arjun4084346/cockroach,vivekmenezes/cockroach,cuongdo/cockroach,cuongdo/cockroach,vaibhavarora/cockroach,veteranlu/cockroach,petermattis/cockroach,petermattis/cockroach,nieyy/cockroach,veteranlu/cockroach,arjun4084346/cockroach,vivekmenezes/cockroach,il9ue/cockroach,maxlang/cockroach,vivekmenezes/cockroach,cockroachdb/cockroach,arjun4084346/cockroach,maxlang/cockroach,vaibhavarora/cockroach,marcuswestin/cockroach,petermattis/cockroach,veteranlu/cockroach,veteranlu/cockroach,nieyy/cockroach,paperstreet/cockroach,il9ue/cockroach,maxlang/cockroach,cuongdo/cockroach,arjun4084346/cockroach,cockroachdb/cockroach,sunya123/cockroach,bg451/cockroach,sunya123/cockroach,il9ue/cockroach,vivekmenezes/cockroach,vaibhavarora/cockroach,nieyy/cockroach,vivekmenezes/cockroach,vaibhavarora/cockroach,bg451/cockroach,cockroachdb/cockroach,sunya123/cockroach,nieyy/cockroach,vaibhavarora/cockroach,glycerine/cockroach,cuongdo/cockroach,glycerine/cockroach,il9ue/cockroach