rbutil: Initial Qt6 support.

Qt6 replaces QTextStream::setCodec() with QTextStream::setEncoding().

Change-Id: I4cfa90d89f54ad49d061ad859585a2a74b5f9786

rbutil/rbutilqt/base/ttssapi.cpp

@@ -143,7 +143,11 @@ bool TTSSapi::start(QString *errStr)
     }
 
     voicestream = new QTextStream(voicescript);
+#if QT_VERSION < 0x060000
     voicestream->setCodec("UTF16-LE");
+#else
+    voicestream->setEncoding(QStringConverter::Utf16LE);
+#endif
 
     m_started = true;
     return true;

rbutil/rbutilqt/base/voicefile.cpp

@@ -217,7 +217,11 @@ void VoiceFileCreator::create(void)
     //read in downloaded file
     emit logItem(tr("Reading strings..."),LOGINFO);
     QTextStream in(&genlang);
+#if QT_VERSION < 0x060000
     in.setCodec("UTF-8");
+#else
+    in.setEncoding(QStringConverter::Utf8);
+#endif
     QString id, voice;
     bool idfound = false;
     bool voicefound=false;

rbutil/rbutilqt/gui/changelog.cpp

@@ -45,7 +45,11 @@ QString Changelog::parseChangelogFile(QString filename)
     QFile changelog(filename);
     changelog.open(QIODevice::ReadOnly);
     QTextStream c(&changelog);
+#if QT_VERSION < 0x060000
     c.setCodec(QTextCodec::codecForName("UTF-8"));
+#else
+    c.setEncoding(QStringConverter::Utf8);
+#endif
     QString text;
     while(!c.atEnd()) {
         QString line = c.readLine();

rbutil/rbutilqt/rbutilqt.cpp

@@ -292,7 +292,11 @@ void RbUtilQt::about()
     QFile credits(":/docs/CREDITS");
     credits.open(QIODevice::ReadOnly);
     QTextStream r(&credits);
+#if QT_VERSION < 0x060000
     r.setCodec(QTextCodec::codecForName("UTF-8"));
+#else
+    r.setEncoding(QStringConverter::Utf8);
+#endif
     while(!r.atEnd()) {
         QString line = r.readLine();
         // filter out header.