wpa_gui-qt4: Fix build with Session Manager disabled in Qt4

When trying to build wpa_gui (Qt4 version) from openembedded it fails
because Qt4 is compiled without session manager and thus wpa_gui fails
to compile.

I attached a patch, that enables compiling without Session Manager (via
preprocessor) if it is not compiled into Qt4; otherwise, it behaves as
it does right now.

I checked to build on my host (Debian unstable, Session Manager
enabled) and openembedded (Session Manager disabled).

wpa_supplicant/wpa_gui-qt4/main.cpp

@@ -24,7 +24,9 @@ class WpaGuiApp : public QApplication
 public:
 	WpaGuiApp(int &argc, char **argv);
 
+#ifndef QT_NO_SESSIONMANAGER
 	virtual void saveState(QSessionManager &manager);
+#endif
 
 	WpaGui *w;
 };
@@ -33,11 +35,13 @@ WpaGuiApp::WpaGuiApp(int &argc, char **argv) : QApplication(argc, argv)
 {
 }
 
+#ifndef QT_NO_SESSIONMANAGER
 void WpaGuiApp::saveState(QSessionManager &manager)
 {
 	QApplication::saveState(manager);
 	w->saveState();
 }
+#endif
 
 
 int main(int argc, char *argv[])

wpa_supplicant/wpa_gui-qt4/wpagui.cpp

@@ -147,6 +147,7 @@ WpaGui::WpaGui(QApplication *_app, QWidget *parent, const char *, Qt::WFlags)
 
 	parse_argv();
 
+#ifndef QT_NO_SESSIONMANAGER
 	if (app->isSessionRestored()) {
 		QSettings settings("wpa_supplicant", "wpa_gui");
 		settings.beginGroup("state");
@@ -155,6 +156,7 @@ WpaGui::WpaGui(QApplication *_app, QWidget *parent, const char *, Qt::WFlags)
 			startInTray = settings.value("in_tray").toBool();
 		settings.endGroup();
 	}
+#endif
 
 	if (QSystemTrayIcon::isSystemTrayAvailable())
 		createTrayIcon(startInTray);
@@ -1721,6 +1723,7 @@ void WpaGui::addInterface()
 }
 
 
+#ifndef QT_NO_SESSIONMANAGER
 void WpaGui::saveState()
 {
 	QSettings settings("wpa_supplicant", "wpa_gui");
@@ -1729,3 +1732,4 @@ void WpaGui::saveState()
 	settings.setValue("in_tray", inTray);
 	settings.endGroup();
 }
+#endif

wpa_supplicant/wpa_gui-qt4/wpagui.h

@@ -40,7 +40,9 @@ public:
 	virtual void disableNetwork(const QString &sel);
 	virtual int getNetworkDisabled(const QString &sel);
 	void setBssFromScan(const QString &bssid);
+#ifndef QT_NO_SESSIONMANAGER
 	void saveState();
+#endif
 
 public slots:
 	virtual void parse_argv();