qt: Log messages with type>QtDebugMsg as non-debug

More important messages should end up in the log no matter
if -debug=qt is set.

src/qt/bitcoin.cpp

@@ -126,15 +126,15 @@ static void initTranslations(QTranslator &qtTranslatorBase, QTranslator &qtTrans
 #if QT_VERSION < 0x050000
 void DebugMessageHandler(QtMsgType type, const char *msg)
 {
-    Q_UNUSED(type);
+    const char *category = (type == QtDebugMsg) ? "qt" : NULL;
-    LogPrint("qt", "GUI: %s\n", msg);
+    LogPrint(category, "GUI: %s\n", msg);
 }
 #else
 void DebugMessageHandler(QtMsgType type, const QMessageLogContext& context, const QString &msg)
 {
-    Q_UNUSED(type);
     Q_UNUSED(context);
-    LogPrint("qt", "GUI: %s\n", qPrintable(msg));
+    const char *category = (type == QtDebugMsg) ? "qt" : NULL;
+    LogPrint(category, "GUI: %s\n", QString::toStdString(msg));
 }
 #endif