clamav: fix gcc6 build
clamav: fix gcc6 build

Building the shipped llvm with gcc6 fails. On the other hand clamav
does not want to work with our system llvm because it's too new (needs < 3.7).

ayghor/void-packages,NeoChontrix/void-packages,WKuipers/void-packages,floGik/void-packages,kulinacs/void-packages,kulinacs/void-packages,jprjr/void-packages,ayghor/void-packages,NeoChontrix/void-packages,necrophcodr/void-packages,opsaaspo/void-packages,floGik/void-packages,opsaaspo/void-packages,ayghor/void-packages,coredumb/void-packages,kulinacs/void-packages,Bubble-be/void-packages,EaterOfCode/void-packages,coredumb/void-packages,Bubble-be/void-packages,jprjr/void-packages,Bubble-be/void-packages,Bubble-be/void-packages,coredumb/void-packages,ayghor/void-packages,NeoChontrix/void-packages,juliendehos/void-packages,jprjr/void-packages,WKuipers/void-packages,opsaaspo/void-packages,juliendehos/void-packages,gangsterakato/void-packages,Bubble-be/void-packages,WKuipers/void-packages,opsaaspo/void-packages,NeoChontrix/void-packages,EaterOfCode/void-packages,liwakura/void-packages,ayghor/void-packages,necrophcodr/void-packages,liwakura/void-packages,coredumb/void-packages,kulinacs/void-packages,kulinacs/void-packages,necrophcodr/void-packages,jprjr/void-packages,floGik/void-packages,EaterOfCode/void-packages,ayghor/void-packages,EaterOfCode/void-packages,NeoChontrix/void-packages,WKuipers/void-packages,liwakura/void-packages,WKuipers/void-packages,EaterOfCode/void-packages,gangsterakato/void-packages,necrophcodr/void-packages,Bubble-be/void-packages,coredumb/void-packages,jprjr/void-packages,gangsterakato/void-packages,floGik/void-packages,NeoChontrix/void-packages,necrophcodr/void-packages,opsaaspo/void-packages,liwakura/void-packages,juliendehos/void-packages,coredumb/void-packages,liwakura/void-packages,juliendehos/void-packages,floGik/void-packages,gangsterakato/void-packages,gangsterakato/void-packages,juliendehos/void-packages,WKuipers/void-packages,liwakura/void-packages,kulinacs/void-packages,jprjr/void-packages,juliendehos/void-packages,opsaaspo/void-packages,gangsterakato/void-packages,floGik/void-packages