Fix unused parameter warnings

Author: kmurray

vpr/SRC/route/router_lookahead_map.cpp

@@ -149,7 +149,7 @@ class PQ_Entry{
 	float R_upstream;
 	float congestion_upstream;
 
-	PQ_Entry(int set_rr_node_ind, int switch_ind, float parent_delay, float parent_R_upstream, float parent_congestion_upstream, bool starting_node){
+	PQ_Entry(int set_rr_node_ind, int /*switch_ind*/, float parent_delay, float /*parent_R_upstream*/, float parent_congestion_upstream, bool starting_node){
 		this->rr_node_ind = set_rr_node_ind;
 
 		auto& device_ctx = g_vpr_ctx.device();