fix for function string references that don't start in the binary
fix for function string references that don't start in the binary

mingderwang/angr,terry2012/angr,zhuyue1314/angr,GuardianRG/angr,tyb0807/angr,haylesr/angr,zhuyue1314/angr,terry2012/angr,iamahuman/angr,fjferrer/angr,f-prettyland/angr,cureHsu/angr,tyb0807/angr,haylesr/angr,f-prettyland/angr,fjferrer/angr,lowks/angr,schieb/angr,axt/angr,tyb0807/angr,chubbymaggie/angr,angr/angr,angr/angr,iamahuman/angr,chubbymaggie/angr,iamahuman/angr,chubbymaggie/angr,xurantju/angr,GuardianRG/angr,schieb/angr,axt/angr,xurantju/angr,schieb/angr,f-prettyland/angr,avain/angr,lowks/angr,cureHsu/angr,mingderwang/angr,avain/angr,angr/angr,axt/angr