vpr: changes to conform to c++17 standard

Author: heshpdx

vpr/src/route/clock_connection_builders.cpp

@@ -49,7 +49,8 @@ void RoutingToClockConnection::create_switches(const ClockRRGraphBuilder& clock_
     // Initialize random seed
     // Must be done during every call in order for restored rr_graphs after a binary
     // search to be consistent
-    std::srand(seed);
+    std::mt19937 rand_generator;
+    rand_generator.seed(seed);
 
     auto& device_ctx = g_vpr_ctx.device();
     const auto& node_lookup = device_ctx.rr_graph.node_lookup();
@@ -68,8 +69,8 @@ void RoutingToClockConnection::create_switches(const ClockRRGraphBuilder& clock_
 
     for (auto clock_index : clock_indices) {
         // Select wires to connect to at random
-        std::random_shuffle(x_wire_indices.begin(), x_wire_indices.end());
-        std::random_shuffle(y_wire_indices.begin(), y_wire_indices.end());
+        std::shuffle(x_wire_indices.begin(), x_wire_indices.end(), rand_generator);
+        std::shuffle(y_wire_indices.begin(), y_wire_indices.end(), rand_generator);
 
         // Connect to x-channel wires
         unsigned num_wires_x = x_wire_indices.size() * fc;