Remove superfluous QT_VERSION_CHECK tests

Change-Id: I09345f1e0cd23591de7a9fe545076cd8a951ee73
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

src/qml/types/qqmlconnections.cpp

@@ -246,12 +246,10 @@ void QQmlConnections::connectSignals()
     if (d->bindings.isEmpty()) {
         connectSignalsToMethods();
     } else {
-#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
         if (lcQmlConnections().isWarningEnabled()) {
             qmlWarning(this) << tr("Implicitly defined onFoo properties in Connections are deprecated. "
                                     "Use this syntax instead: function onFoo(<arguments>) { ... }");
         }
-#endif
         connectSignalsToBindings();
     }
 }

src/qmltest/qtestoptions_p.h

@@ -15,12 +15,7 @@
 // We mean it.
 //
 
-#if QT_VERSION < QT_VERSION_CHECK(5, 11, 0)
-# include <QtTest/qtest_global.h>
-# include <QtCore/private/qglobal_p.h>
-#else
 # include <QtTest/qttestglobal.h>
-#endif
 
 #include <QtCore/qstring.h>
 #include <QtCore/qstringlist.h>