Implement function enet_socket_set_option using ENetSocket class's methods.

Implemented options:
 - ENET_SOCKOPT_NONBLOCK
 - ENET_SOCKOPT_BROADCAST
 - ENET_SOCKOPT_REUSEADDR
 - ENET_SOCKOPT_NODELAY
Not implemented options:
 - ENET_SOCKOPT_RCVBUF
 - ENET_SOCKOPT_SNDBUF
 - ENET_SOCKOPT_RCVTIMEO
 - ENET_SOCKOPT_SNDTIMEO

thirdparty/enet/godot.cpp

@@ -216,6 +216,46 @@ int enet_socket_listen(ENetSocket socket, int backlog) {
 
 int enet_socket_set_option(ENetSocket socket, ENetSocketOption option, int value) {
 
+	NetSocket *sock = (NetSocket *)socket;
+
+	switch (option) {
+		case ENET_SOCKOPT_NONBLOCK: {
+			sock->set_blocking_enabled(value ? false : true);
+			return 0;
+		} break;
+
+		case ENET_SOCKOPT_BROADCAST: {
+			sock->set_broadcasting_enabled(value ? true : false);
+			return 0;
+		} break;
+
+		case ENET_SOCKOPT_REUSEADDR: {
+			sock->set_reuse_address_enabled(value ? true : false);
+			return 0;
+		} break;
+
+		case ENET_SOCKOPT_RCVBUF: {
+			return -1;
+		} break;
+
+		case ENET_SOCKOPT_SNDBUF: {
+			return -1;
+		} break;
+
+		case ENET_SOCKOPT_RCVTIMEO: {
+			return -1;
+		} break;
+
+		case ENET_SOCKOPT_SNDTIMEO: {
+			return -1;
+		} break;
+
+		case ENET_SOCKOPT_NODELAY: {
+			sock->set_tcp_no_delay_enabled(value ? true : false);
+			return 0;
+		} break;
+	}
+
 	return -1;
 }