xconfig: fix 'Show Debug' functionality

xconfig - Fix missing 'Show Debug' functionality.

xconfig Help mentions 'Show Debug Info' but it was missing from any
menu.

* Add 'Show debug' menu to the main menu.
* Properly load showDebug settings.

Reported-by: Jason Vas Dias <jason.vas.dias@gmail.com>
Signed-off-by: Boris Barbulovski <bbarbulovski@gmail.com>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Michal Marek <mmarek@suse.com>

scripts/kconfig/qconf.cc

@@ -1014,7 +1014,7 @@ ConfigInfoView::ConfigInfoView(QWidget* parent, const char *name)
 
 	if (!objectName().isEmpty()) {
 		configSettings->beginGroup(objectName());
-		_showDebug = configSettings->value("/showDebug", false).toBool();
+		setShowDebug(configSettings->value("/showDebug", false).toBool());
 		configSettings->endGroup();
 		connect(configApp, SIGNAL(aboutToQuit()), SLOT(saveSettings()));
 	}
@@ -1474,6 +1474,7 @@ ConfigMainWindow::ConfigMainWindow(void)
 	optionMenu->addSeparator();
 	optionMenu->addActions(optGroup->actions());
 	optionMenu->addSeparator();
+	optionMenu->addAction(showDebugAction);
 
 	// create help menu
 	menu->addSeparator();