Drop Qt5: Manual tests: Remove code below Qt 6.0.0

Change-Id: I87e267415ec84001ff594b3900ce8be4f0cadd73
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

tests/manual/proparser/main.cpp

@@ -142,13 +142,8 @@ int main(int argc, char **argv)
 
     QMakeGlobals option;
     QString qmake = QString::fromLocal8Bit(qgetenv("TESTREADER_QMAKE"));
-    if (qmake.isEmpty()) {
+    if (qmake.isEmpty())
-#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
-        qmake = QLibraryInfo::location(QLibraryInfo::BinariesPath) + QLatin1String("/qmake");
-#else
         qmake = QLibraryInfo::path(QLibraryInfo::BinariesPath) + QLatin1String("/qmake");
-#endif
-    }
     option.qmake_abslocation = QDir::cleanPath(qmake);
     option.initProperties();
 

tests/manual/widgets/crumblepath/tst_manual_widgets_crumblepath.cpp

@@ -93,10 +93,6 @@ QWidget *shrinkingCrumblePath()
 
 int main(int argc, char *argv[])
 {
-#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
-    QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
-#endif // Qt < 6
-
     QApplication app(argc, argv);
 
     auto *widget = new QWidget;

tests/manual/widgets/infolabel/tst_manual_widgets_infolabel.cpp

@@ -39,10 +39,6 @@ using namespace Utils;
 
 int main(int argc, char *argv[])
 {
-#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
-    QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
-#endif // Qt < 6
-
     QApplication app(argc, argv);
 
     auto widget = new QWidget;

tests/manual/widgets/manhattanstyle/tst_manual_widgets_manhattanstyle.cpp

@@ -123,11 +123,6 @@ static QWidget *centralWidget()
 
 int main(int argc, char *argv[])
 {
-#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
-    QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
-    QApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
-#endif // Qt < 6
-
     QApplication app(argc, argv);
 
     QMainWindow window;