avoid 'unknown syscall' prompt in CFG
avoid 'unknown syscall' prompt in CFG

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