hide start at boot option if not supported

netsoul/dialogoptions.cpp

 	ui->spinAutoreconnectInterval->setValue(Options::instance()->getAutoReconnectInterval());
 	connect(this, SIGNAL(accepted()), this, SLOT(save()));
 
+#ifndef Q_OS_WIN
+	ui->checkStartAtBoot->hide();
+	ui->label->hide();
+#endif
+
 }
 
 DialogOptions::~DialogOptions()