Fix IdLess compilation with gcc8
Fix IdLess compilation with gcc8

Signed-off-by: David Shah <4be9b043912c80de45ffb490ebd07e45bc0fcd34@gmail.com>

cseed/arachne-pnr,cseed/arachne-pnr,SymbiFlow/arachne-pnr,cseed/arachne-pnr,SymbiFlow/arachne-pnr,SymbiFlow/arachne-pnr