apple search PISerial test

git-svn-id: svn://db.shs.com.ru/pip@954 12ceb7fc-bf1f-11e4-8940-5bc7170c53b5

src_main/io_devices/piserial.cpp

@@ -821,6 +821,10 @@ PIStringList PISerial::availableDevices(bool test) {
 			<< "ttyMI" << "ttymxc" << "ttyAMA" << "rfcomm" << "ircomm";
 #      ifdef FREE_BSD
 	prefixes << "cu";
+#      endif
+#      ifdef APPLE
+	prefixes.clear();
+	prefixes << "cu." << "tty.";
 #      endif
 	PIFile file_prefixes("/proc/tty/drivers", PIIODevice::ReadOnly);
 	if (file_prefixes.open()) {